Aisin–Toyota 8-speed automatic transmission

AA 80E/F · AE 80E/F · AL 80E/F
TR-80SD · TR-81SD · TR-82SD
AW F8 F35 · AW F8 F45
AA 80E/F · AE 80E/F · AL 80E/F; TR-80SD · TR-81SD · TR-82SD; AW F8 F35 · AW F8 F45
	Cutaway of an AW F8 F35
Overview
Manufacturer	Toyota · Aisin AW
Also called	BMW/Mini GA 8F 22AW; Volvo TG-81SC/SD; GM AW F8 F45 & AF50-8; VW AQ 450; PSA EAT8
Production	2006–present
Body and chassis
Class	8-speed automatic transmission
Related	ZF 8HP · GM 8L · ZF 9HP
Chronology
Predecessor	AWTF-80 SC transmission

Aisin and Toyota offer various 8-speed automatic transmissions for use in both longitudinal^[a]^[1] and transverse^[b]^[2] engine vehicles, based on a common, globally patented gearset concept.^[a]^[1]^[b]^[2]

The Aisin TL-80SN (Toyota AA 80E/AA 80F/AA 81E) series is the world's first 8-speed automatic transmission for passenger cars.^[3] It is designed for longitudinal engines^[a]^[1] and was first used in the 2007 model year Lexus LS 460.

Beginning with the AW F8 transmission Aisin and Toyota derived a transverse engine variant^[b]^[2] by adapting this globally patented gearset concept to fit into the same space as the previous generation U6xx Lepelletier gear mechanism-based 6-speed transmissions to increase the overall ratio spread, reduce gear steps, and increase the torque capacity for transverse engine vehicles as well.^[4]

The Aisin AW F8 F45 (Toyota UA 80E/UA 80F) series is the world's first 8-speed automatic transmission designed for use in transverse engine^[b]^[2] applications.^[5] It is also called EAT8 (PSA), GA 8F 22AW (BMW/Mini), TG-81SC (Volvo),^[6] AF50-8 (Opel/Vauxhall),^[7] AW F8 F45 (Cadillac),^[8] and AQ 450 (Volkswagen Group).^[9] First usage was in the 2013 model year Lexus RX 350 F Sport.

Toyota’s marketing name for the transmission is "Direct Shift – 8AT 8-speed automatic transmission".^[10]^[11] In contrast to the UB 80E/F transmission, which was developed by Aisin AW for Toyota, the UA 80E/F was developed in a joint venture between Toyota and Aisin AW. Due to its worldwide application, development was carried out in a global manner involving R&D resources in Japan and the US. The Aisin AW F8 F35 (Toyota UB 80E/F) transmissions are used for lower torque applications, such as 4-cylinder engines, and rated for 300 N⋅m (221 lb⋅ft).^[12]

Gear Ratios^[c]
Aisin	Toyota	Gear Year	R2^[d]	R1	1	2	3	4	5	6	7	8	Total Span	Span Center	Avg. Step	Compo- nents

Longitudinal engines^[a]^[1]																3 Gearsets 2 Brakes 4 Clutches
TL-80SN	AA 80E/F	2006	−2.176	−4.056	4.597	2.724	1.864	1.464	1.231	1.000	0.824	0.685	6.709	1.775	1.312
—	AB 80E/F	2015	−2.053	−3.786	4.796	2.811	1.844	1.429	1.214	1.000	0.818	0.672	7.132	1.796	1.324
TR-80SD	AE 80E/F	2010	−2.053	−3.825	4.845	2.840	1.864	1.437	1.217	1.000	0.816	0.672	7.206	1.805	1.326
TR-81SD	—	2010	−2.182	−4.066	4.970	2.840	1.864	1.437	1.210	1.000	0.825	0.686	7.247	1.846	1.327
TR-82SD	—	2010	−2.182	−4.024	4.919	2.811	1.844	1.429	1.207	1.000	0.827	0.686	7.173	1.836	1.325
—	AL 80E/F	2023	−1.870	−3.646	4.413	2.808	1.950	1.511	1.274	1.000	0.793	0.652	6.774	1.696	1.314
Transverse engines^[b]^[2]
AW F8 F45	UA 80E/F	2016	−2.059	−4.221	5.519	3.184	2.050	1.492	1.235	1.000	0.801	0.673	8.200	1.927	1.351
AW F8 F35	UB 80E/F	2017	−2.059	−4.015	5.250	3.029	1.950	1.457	1.221	1.000	0.809	0.673	7.800	1.880	1.341
TG-80LS	UB 80E/F	2017	−2.053	−4.003	5.070	2.972	1.950	1.470	1.231	1.000	0.808	0.672	7.540	1.846	1.335
TBD	TBD	TBD	−2.182	−4.255	5.200	2.971	1.950	1.470	1.224	1.000	0.817	0.686	7.583	1.888	1.336

^ ^a ^b ^c ^d See also Toyota A transmission
^ ^a ^b ^c ^d ^e See also Toyota U transmission
^ Differences in gear ratios have a measurable, direct impact on vehicle dynamics, performance, waste emissions as well as fuel mileage
^ Logically, the gearset concept (layout) provides for this 2nd reverse gear, but it will most likely not be used in the transmissions that the car manufacturers eventually bring to market. In some data sheets, the gear ratio of R2 is given, presumably a careless error^[1]^[13]^[14]

Specifications

Layout (Gearset Concept)

All 8-speed automatic transmissions from Aisin and Toyota for passenger cars are based on the same layout^[a]^[1]^[b]^[2] in both engines orientations.^[a]^[1]^[b]^[2] For transverse installation,^[b]^[2] the layout of the longitudinal installation^[a]^[1] was merely mirrored.^[a]^[1]^[b]^[2] Gearset 1 is not an ordinary one, but a reversed one. It consists of 2 pinions that mesh with each other. One of these pinions meshes with the sun gear, the other with the ring gear. As a results, the gearset generates different ratios and the sun gear rotates in the same direction as the ring gear when the planetary gear carrier is stationary. This made it possible to manage 8 speeds with 3 gearsets. As a result, the transmission is more compact than 8-speed transmissions from competitors. This means that an 8-speed automatic transmission was also possible for transverse engines.

Progress

Smaller parts and a hydraulic circuit with fewer components allow the transmission to maintain the same size as the previous LS 430's 6-speed transmission. The aluminum die-cast case is 10 % lighter, yet 30 % more rigid, even with two additional gears and a 22 % greater torque capacity the new transmission weighs 95 kg (209 lb) or 10 % more than the previous unit. With new micro-laser technology gear tooth production tolerances have been reduced 50 %. Aluminum has also replaced steel on gear tooth surfaces. Shift times are as low as 350 milliseconds or 41 % faster than the previous LS 430's unit.

The Lexus IS F and LS 460 (with sport package) use Sport Direct Shift (SPDS) which allows for faster shift times. The torque converter can lockup from 2nd to 8th gears.

Two Possible Reverse Gears R1 and R2 (R2 Shaded Gray)

The gearset concept offers 2 reverse gears. Due to the increasing electronic control of automatic transmissions and engines, a fast reverse gear (i.e. designed to reduce wheel spin) is no longer necessary for problem-free starting in icy conditions (winter mode). It is therefore unlikely that car manufacturers will make use of this special option of a dedicated winter mode with an additional reverse gear R2. For this reason, the representation of R2 in the tables is shaded gray throughout. In some data sheets, the gear ratio of R2 is given, presumably a careless error.^[1]^[13]^[14]

The direction is reversed in gearset 3, the outer one of the Ravigneaux gearset. In the fast reverse gear R2, this part of the Ravigneaux gearset is directly connected to the input (turbine) side. To reduce the shaft speed for an appropriate reverse gear R1, the input (turbine) is put through gearset 1 first. This reduction corresponds to the ratio of the 3rd gear. Therefore, the gear step between the two reverse gears reflects the ratio of the 3rd gear.

R1 And R2
Gear	Ratio · Algebra
R2	$i_{R2}=-{\tfrac {R_{3}}{S_{3}}}$ ^[a]^[1]^[b]^[2]^[14]^[13]
3	$i_{3}={\tfrac {R_{1}}{R_{1}-S_{1}}}$
R2 x 3	$i_{R2}i_{3}=-{\tfrac {R_{3}}{S_{3}}}{\tfrac {R_{1}}{R_{1}-S_{1}}}={\tfrac {R_{3}}{S_{3}}}{\tfrac {R_{1}}{S_{1}-R_{1}}}$

R1	$i_{R1}={\tfrac {R_{1}R_{3}}{S_{3}(S_{1}-R_{1})}}=i_{R2}i_{3}$

Ratios

Drivetrain
Model	Final Drive
AA 80E	2.937 2.85 2.69
AA 80F	3.133
AW F8 F35 AW F8 F45	4.398
AW F8 F45	3.075 3.200
AW F8 F45	2.561

^ ^a ^b ^c ^d ^e See also Toyota A transmission
^ ^a ^b ^c ^d ^e See also Toyota U transmission

Gear Ratios
With Assessment				Planetary Gearset: Teeth^[a]				Count	Total^[b] Center^[c]	Avg.^[d]
With Assessment				Reversed	Ravigneaux			Count	Total^[b] Center^[c]	Avg.^[d]

Aisin Toyota	Version First Delivery			S₁^[e] R₁^[f]	S₂^[g] R₂^[h]	S₃^[i] R₃^[j]		Brakes Clutches	Ratio Span	Gear Step^[k]
Gear Ratio	R2^[l] ${i_{R2}}$	R1 ${i_{R1}}$	1 ${i_{1}}$	2 ${i_{2}}$	3 ${i_{3}}$	4 ${i_{4}}$	5 ${i_{5}}$	6 ${i_{6}}$	7 ${i_{7}}$	8 ${i_{8}}$
Step^[k]	${\tfrac {i_{R1}}{i_{R2}}}$	$-{\tfrac {i_{R1}}{i_{1}}}$ ^[m]	${\tfrac {i_{1}}{i_{1}}}$	${\tfrac {i_{1}}{i_{2}}}$ ^[n]	${\tfrac {i_{2}}{i_{3}}}$	${\tfrac {i_{3}}{i_{4}}}$	${\tfrac {i_{4}}{i_{5}}}$	${\tfrac {i_{5}}{i_{6}}}$	${\tfrac {i_{6}}{i_{7}}}$	${\tfrac {i_{7}}{i_{8}}}$
Δ Step^[o]^[p]				${\tfrac {i_{1}}{i_{2}}}:{\tfrac {i_{2}}{i_{3}}}$	${\tfrac {i_{2}}{i_{3}}}:{\tfrac {i_{3}}{i_{4}}}$	${\tfrac {i_{3}}{i_{4}}}:{\tfrac {i_{4}}{i_{5}}}$	${\tfrac {i_{4}}{i_{5}}}:{\tfrac {i_{5}}{i_{6}}}$	${\tfrac {i_{5}}{i_{6}}}:{\tfrac {i_{6}}{i_{7}}}$	${\tfrac {i_{6}}{i_{7}}}:{\tfrac {i_{7}}{i_{8}}}$
Shaft Speed	${\tfrac {i_{1}}{i_{R2}}}$	${\tfrac {i_{1}}{i_{R1}}}$	${\tfrac {i_{1}}{i_{1}}}$	${\tfrac {i_{1}}{i_{2}}}$	${\tfrac {i_{1}}{i_{3}}}$	${\tfrac {i_{1}}{i_{4}}}$	${\tfrac {i_{1}}{i_{5}}}$	${\tfrac {i_{1}}{i_{6}}}$	${\tfrac {i_{1}}{i_{7}}}$	${\tfrac {i_{1}}{i_{8}}}$
Δ Shaft Speed^[q]	${\tfrac {i_{1}}{i_{R1}}}-{\tfrac {i_{1}}{i_{R2}}}$	$0-{\tfrac {i_{1}}{i_{R1}}}$	${\tfrac {i_{1}}{i_{1}}}-0$	${\tfrac {i_{1}}{i_{2}}}-{\tfrac {i_{1}}{i_{1}}}$	${\tfrac {i_{1}}{i_{3}}}-{\tfrac {i_{1}}{i_{2}}}$	${\tfrac {i_{1}}{i_{4}}}-{\tfrac {i_{1}}{i_{3}}}$	${\tfrac {i_{1}}{i_{5}}}-{\tfrac {i_{1}}{i_{4}}}$	${\tfrac {i_{1}}{i_{6}}}-{\tfrac {i_{1}}{i_{5}}}$	${\tfrac {i_{1}}{i_{7}}}-{\tfrac {i_{1}}{i_{6}}}$	${\tfrac {i_{1}}{i_{8}}}-{\tfrac {i_{1}}{i_{7}}}$

Longitudinal engines^[r]^[1]
TL-80SN AA 80E/F	550 N⋅m (406 lb⋅ft) · 2006			38 82	30 34	34 74		2 4	6.7091 1.7748	1.3125^[k]
Gear Ratio	−2.1765^[l]^[1] ^[13]^[14] $-{\tfrac {37}{17}}$	−4.0561^[m] $-{\tfrac {1,517}{374}}$	4.5970 ${\tfrac {1,517}{330}}$	2.7241^[n] ${\tfrac {12,136}{4,455}}$	1.8636 ${\tfrac {41}{22}}$	1.4642^[k]^[q] ${\tfrac {24,272}{16,577}}$	1.2313^[p]^[q] ${\tfrac {1,517}{1,232}}$	1.0000 ${\tfrac {1}{1}}$	0.8245 ${\tfrac {1,517}{1,840}}$	0.6852 ${\tfrac {37}{54}}$
Step	1.8636	0.8824^[m]	1.0000	1.6875^[n]	1.4617	1.2728^[k]	1.1891	1.2313	1.2129	1.2033
Δ Step^[o]				1.1545	1.1484	1.0704	0.9657^[p]	1.0152	1.0080
Speed	–2.1121	-1.1333	1.0000	1.6875	2.4667	3.1396	3.7333	4.5970	5.5758	6.7091
Δ Speed	0.9788	1.1333	1.0000	0.6875	0.7792	0.6729^[q]	0.5938^[q]	0.8636	0.9788	1.1333

— AB 80E/F	— 550 N⋅m (406 lb⋅ft)^[15] · 2015			38 83	30 38	38 78		2 4	7.1319 1.7957	1.3240^[k]
Gear Ratio	−2.0526^[l] $-{\tfrac {39}{19}}$	−3.7860^[m] $-{\tfrac {1,079}{285}}$	4.7956 ${\tfrac {1,079}{225}}$	2.8112^[n]^[p] ${\tfrac {18,343}{6,525}}$	1.8444 ${\tfrac {83}{45}}$	1.4294^[k]^[q] ${\tfrac {18,343}{12,833}}$	1.2137^[p]^[q] ${\tfrac {1,079}{889}}$	1.0000^[p] ${\tfrac {1}{1}}$	0.8176 ${\tfrac {3,237}{3,959}}$	0.6724 ${\tfrac {39}{58}}$
Step	1.8444	0.7895^[m]	1.0000	1.7059^[n]	1.5241	1.2904^[k]	1.1777	1.2137	1.2230	1.2160
Δ Step^[o]				1.1192^[p]	1.1811	1.0957	0.9703^[p]	0.9924^[p]	1.0058
Speed	–2.3363	-1.2667	1.0000	1.7059	2.6000	3.3550	3.9511	4.7956	5.8653	7.1319
Δ Speed	1.0696	1.2667	1.0000	0.7059	0.8941	0.7550^[q]	0.5961^[q]	0.8444	1.0696	1.2667

TR-80SD AE 80E/F	550 N⋅m (406 lb⋅ft)^[16] · 2010			38 82	30 38	38 74		2 4	7.2061 1.8050	1.3260^[k]
Gear Ratio	−2.0526^[l] $-{\tfrac {39}{19}}$	−3.8254^[m] $-{\tfrac {1,599}{418}}$	4.8455 ${\tfrac {533}{110}}$	2.8404^[n]^[p] ${\tfrac {9,061}{3,190}}$	1.8636 ${\tfrac {41}{22}}$	1.4369^[k]^[q] ${\tfrac {9,061}{3,190}}$	1.2169^[p]^[q] ${\tfrac {533}{438}}$	1.0000^[p] ${\tfrac {1}{1}}$	0.8158 ${\tfrac {1,599}{1,960}}$	0.6724 ${\tfrac {39}{58}}$
Step	1.8636	0.7895^[m]	1.0000	1.7059^[n]	1.5241	1.2970^[k]	1.1808	1.2169	1.2258	1.2133
Δ Step^[o]				1.1192^[p]	1.1751	1.0984	0.9703^[p]	0.9928^[p]	1.0103
Speed	–2.3606	-1.2667	1.0000	1.7059	2.6000	3.3722	3.9818	4.8455	5.9394	7.2061
Δ Speed	1.0939	1.2667	1.0000	0.7059	0.8941	0.7722^[q]	0.6096^[q]	0.8636	1.0939	1.2667

TR-81SD —	600 N⋅m (443 lb⋅ft)^[17] · 2010 —			38 82	36^[s] 44	44^[s] 96		2 4	7.2475 1.8460	1.3270^[k]
Gear Ratio	−2.1818^[l] $-{\tfrac {24}{11}}$	−4.0661^[m] $-{\tfrac {492}{121}}$	4.9697 ${\tfrac {164}{33}}$	2.8398^[n]^[p] ${\tfrac {656}{2315}}$	1.8636 ${\tfrac {41}{22}}$	1.4370^[k]^[q] ${\tfrac {1,312}{913}}$	1.2103^[p]^[q] ${\tfrac {328}{271}}$	1.0000^[p] ${\tfrac {1}{1}}$	0.8248 ${\tfrac {984}{1193}}$	0.6857 ${\tfrac {24}{35}}$
Step	1.8636	0.8181^[m]	1.0000	1.7500^[n]	1.5238	1.2969^[k]	1.1873	1.2103	1.2124	1.2028
Δ Step^[o]				1.1484^[p]	1.1750	1.0923	0.9810^[p]	0.9983^[p]	1.0079
Speed	–2.2778	-1.2222	1.0000	1.7500	2.6667	3.4583	4.1061	4.9697	6.0253	7.2475
Δ Speed	1.0556	1.2222	1.0000	0.7500	0.9167	0.7917^[q]	0.6477^[q]	0.8636	1.0556	1.2222

TR-82SD —	850 N⋅m (627 lb⋅ft)^[18] · 2010 —			38 83	36^[s] 44	44^[s] 96		2 4	7.1728 1.8365	1.3251^[k]
Gear Ratio	−2.1818^[l] $-{\tfrac {24}{11}}$	−4.0242^[m] $-{\tfrac {664}{165}}$	4.9185 ${\tfrac {664}{135}}$	2.8106^[n]^[p] ${\tfrac {2656}{945}}$	1.8444 ${\tfrac {83}{45}}$	1.4295^[k]^[q] ${\tfrac {1,328}{929}}$	1.2073^[p]^[q] ${\tfrac {332}{275}}$	1.0000^[p] ${\tfrac {1}{1}}$	0.8266 ${\tfrac {996}{1205}}$	0.6857 ${\tfrac {24}{35}}$
Step	1.8444	0.8181^[m]	1.0000	1.7500^[n]	1.5238	1.2903^[k]	1.1841	1.2073	1.2098	1.2054
Δ Step^[o]				1.1484^[p]	1.1810	1.0897	0.9808^[p]	0.9979^[p]	1.0037
Speed	–2.2543	-1.2222	1.0000	1.7500	2.6667	3.4407	4.0741	4.9185	5.9506	7.1728
Δ Speed	1.0321	1.2222	1.0000	0.7500	0.9167	0.7741^[q]	0.6333^[q]	0.8444	1.0321	1.2222

— AL 80E/F	— TBD · 2023			38 78	38 46	46 86		2 4	6.7737 1.6957	1.3143^[k]
Gear Ratio	−1.8696^[l] $-{\tfrac {43}{23}}$	−3.6457^[m] $-{\tfrac {1,677}{460}}$	4.4132 ${\tfrac {1,677}{380}}$	2.8084^[n]^[p] ${\tfrac {35,217}{12,540}}$	1.9500 ${\tfrac {39}{20}}$	1.5112^[k]^[q] ${\tfrac {35,217}{23,304}}$	1.2743^[p]^[q] ${\tfrac {1,677}{1,316}}$	1.0000^[p] ${\tfrac {1}{1}}$	0.7933 ${\tfrac {1,677}{2,114}}$	0.6515 ${\tfrac {43}{66}}$
Step	1.9500	0.8261^[m]	1.0000	1.5714	1.4402	1.2904^[k]	1.1859	1.2743	1.2606	1.2176
Δ Step^[o]				1.0911^[p]	1.1161	1.0881	0.9306^[p]	1.0109^[p]	1.0353
Speed	–2.3605	-1.2105	1.0000	1.5714	2.2632	2.9203	3.4632	4.4132	5.5632	6.7737
Δ Speed	1.1500	1.2105	1.0000	0.5714	0.6917	0.6571^[q]	0.5429^[q]	0.9500	1.1500	1.2105
Transverse engines^[t]^[2]
AW F8 F35 UB 80E/F	300 N⋅m (221 lb⋅ft)^[12] · 2013			38 78	26 34	34 70		2 4	7.8000 1.8798	1.3410^[k]
Gear Ratio	−2.0588^[l] $-{\tfrac {35}{17}}$	−4.0147^[m] $-{\tfrac {273}{68}}$	5.2500 ${\tfrac {21}{4}}$	3.0288^[n]^[p] ${\tfrac {315}{104}}$	1.9500 ${\tfrac {39}{20}}$	1.4570^[k]^[q] ${\tfrac {1,575}{1,081}}$	1.2209^[p]^[q] ${\tfrac {105}{86}}$	1.0000^[p] ${\tfrac {1}{1}}$	0.8086 ${\tfrac {1,365}{1,688}}$	0.6731 ${\tfrac {35}{52}}$
Step	1.9500	0.7647^[m]	1.0000	1.7333^[n]	1.5533	1.3384^[k]	1.1933	1.2209	1.2366	1.2014
Δ Step^[o]				1.1159^[p]	1.1605	1.1215	0.9774^[p]	0.9873^[p]	1.0293
Speed	–2.5500	-1.3077	1.0000	1.7333	2.6923	3.6033	4.3000	5.2500	6.4923	7.5833
Δ Speed	1.2423	1.3077	1.0000	0.7333	0.9590	0.9110^[q]	0.6967^[q]	0.9500	1.2423	1.3077

AW F8 F45 UA 80E/F	430 N⋅m (317 lb⋅ft) · 2013^[8]			42 82	26 34	34 70		2 4	8.2000 1.9274	1.3507^[k]
Gear Ratio	−2.0588^[l] $-{\tfrac {35}{17}}$	−4.2206^[m] $-{\tfrac {287}{68}}$	5.5192 ${\tfrac {287}{52}}$	3.1842^[n]^[p] ${\tfrac {4,305}{1,352}}$	2.0500^[p] ${\tfrac {41}{20}}$	1.4920 ${\tfrac {3,075}{2,061}}$	1.2349^[p]^[q] ${\tfrac {205}{166}}$	1.0000^[p] ${\tfrac {1}{1}}$	0.8008 ${\tfrac {205}{256}}$	0.6731 ${\tfrac {35}{52}}$
Step	2.0500	0.7647^[m]	1.0000	1.7333^[n]	1.5533	1.3740	1.2082	1.2349	1.2488	1.1897
Δ Step^[o]				1.1159^[p]	1.1305^[p]	1.1372	0.9783^[p]	0.9889^[p]	1.0496
Speed	–2.6808	-1.3077	1.0000	1.7333	2.6923	3.6992	4.4692	5.5192	6.8923	8.2000
Δ Speed	1.3731	1.3077	1.0000	0.7333	0.9590	1.0069	0.7700^[q]	1.0500	1.3731	1.3077

TG-80LS UB 80E/F	350 N⋅m (258 lb⋅ft) · 2017			38 78	30 38	38 78		2 4	7.5400 1.8464	1.3346^[k]
Gear Ratio	−2.0526^[l] $-{\tfrac {39}{19}}$	−4.0026^[m] $-{\tfrac {1,521}{380}}$	5.0700 ${\tfrac {507}{100}}$	2.9721^[n]^[p] ${\tfrac {8,619}{2,900}}$	1.9500 ${\tfrac {39}{20}}$	1.4698^[k]^[q] ${\tfrac {8,619}{5,864}}$	1.2306^[p]^[q] ${\tfrac {9,633}{7,828}}$	1.0000^[p] ${\tfrac {1}{1}}$	0.8082 ${\tfrac {1,521}{1,882}}$	0.6724 ${\tfrac {39}{58}}$
Step	1.9500	0.7895^[m]	1.0000	1.7059^[n]	1.5241	1.3267^[k]	1.1944	1.2306	1.2373	1.2019
Δ Step^[o]				1.1192^[p]	1.1488	1.1108	0.9706^[p]	0.9945^[p]	1.0295
Speed	–2.4700	-1.2667	1.0000	1.7059	2.6000	3.4494	4.1200	5.0700	6.2733	7.5400
Δ Speed	1.2033	1.2667	1.0000	0.7059	0.8941	0.8494^[q]	0.6706^[q]	0.9500	1.2033	1.2667

TBD	TBD · TBD			38 78	36^[s] 44	44^[s] 96		2 4	7.5833 1.8883	1.3357^[k]
Gear Ratio	−2.1818^[l] $-{\tfrac {24}{11}}$	−4.2545^[m] $-{\tfrac {234}{55}}$	5.2000 ${\tfrac {26}{5}}$	2.9714^[n]^[p] ${\tfrac {104}{35}}$	1.9500 ${\tfrac {39}{20}}$	1.4700^[k]^[q] ${\tfrac {416}{283}}$	1.2235^[p]^[q] ${\tfrac {104}{85}}$	1.0000^[p] ${\tfrac {1}{1}}$	0.8175 ${\tfrac {936}{1,145}}$	0.6857 ${\tfrac {24}{35}}$
Step	1.9500	0.8181^[m]	1.0000	1.7500^[n]	1.5238	1.3266^[k]	1.2014	1.2235	1.2233	1.1921
Δ Step^[o]				1.1484^[p]	1.1486	1.1042	0.9819^[p]	1.0002^[p]	1.0261
Speed	–2.3833	-1.2222	1.0000	1.7500	2.6667	3.5375	4.2500	5.200	6.3611	7.5833
Δ Speed	1.1611	1.2222	1.0000	0.7500	0.9167	0.8708^[q]	0.7125^[q]	0.9500	1.1611	1.2222

Ratio R & Even	$i_{R2}=-{\tfrac {R_{3}}{S_{3}}}$ ^[l]		${\tfrac {R_{1}R_{3}(S_{2}+R_{2})}{S_{2}(R_{1}-S_{1})(S_{3}+R_{3})}}$		${\tfrac {R_{1}R_{3}(S_{2}+R_{2})}{S_{2}R_{3}(R_{1}-S_{1})+R_{1}R_{2}R_{3}-S_{1}S_{2}S_{3}}}$			$i_{6}={\tfrac {1}{1}}$	$i_{8}={\tfrac {R_{3}}{S_{3}+R_{3}}}$
Ratio R & Odd	$i_{R1}={\tfrac {R_{1}R_{3}}{S_{3}(S_{1}-R_{1})}}$		$i_{1}={\tfrac {R_{1}R_{2}R_{3}}{S_{2}S_{3}(R_{1}-S_{1})}}$		$i_{3}={\tfrac {R_{1}}{R_{1}-S_{1}}}$		${\tfrac {R_{1}R_{2}R_{3}}{R_{1}R_{2}R_{3}-S_{1}S_{2}S_{3}}}$		${\tfrac {R_{1}R_{3}}{R_{1}R_{3}-S_{1}S_{3}}}$
Algebra And Actuated Shift Elements
Brake A				❶						❶
Brake B	❶^[l]	❶	❶
Clutch C			❶	❶	❶	❶	❶
Clutch D							❶	❶	❶	❶
Clutch E		❶			❶				❶
Clutch F	❶^[l]					❶		❶

^ Layout Input and output are on opposite sides Planetary gearset 1 is on the input (turbine) side Input shafts are C₁ (planetary gear carrier of reversed gearset 1) and, if actuated, C₂ and C₃ (the compound planetary gear carrier of the Ravigneaux gearset) Output shaft is R₃ (ring gear of outer Ravigneaux gearset) ^ Total Ratio Span (Total Ratio Spread · Total Gear Ratio) ${\tfrac {i_{n}}{i_{1}}}$ A wider span enables the downspeeding when driving outside the city limits increase the climbing ability when driving over mountain passes or off-road or when towing a trailer ^ Ratio Span's Center $(i_{n}i_{1})^{\tfrac {1}{2}}$ The center indicates the speed level of the transmission Together with the final drive ratio it gives the shaft speed level of the vehicle ^ Average Gear Step $({\tfrac {i_{n}}{i_{1}}})^{\tfrac {1}{n-1}}$ With decreasing step width the gears connect better to each other shifting comfort increases ^ Sun 1: sun gear of gearset 1: reversed gearset ^ Ring 1: ring gear of gearset 1 reversed gearset ^ Sun 2: sun gear of gearset 2: inner Ravigneaux gearset ^ Ring 2: ring gear of gearset 2: inner Ravigneaux gearset ^ Sun 3: sun gear of gearset 3: outer Ravigneaux gearset ^ Ring 3: ring gear of gearset 3: outer Ravigneaux gearset ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ ^o ^p ^q ^r ^s ^t ^u ^v ^w ^x ^y ^z ^aa ^ab ^ac ^ad Standard 50:50 — 50 % Is Above And 50 % Is Below The Average Gear Step — With steadily decreasing gear steps (yellow highlighted line Step) and a particularly large step from 1st to 2nd gear the lower half of the gear steps (between the small gears; rounded down, here the first 3) is always larger and the upper half of the gear steps (between the large gears; rounded up, here the last 4) is always smaller than the average gear step (cell highlighted yellow two rows above on the far right) lower half: smaller gear steps are a waste of possible ratios (red bold) upper half: larger gear steps are unsatisfactory (red bold) ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ Logically, the gearset concept (layout) provides for this 2nd reverse gear, but it will most likely not be used in the transmissions that the car manufacturers eventually bring to market. In some data sheets, the gear ratio of R2 is given, presumably a careless error^[1]^[13]^[14] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ ^o ^p ^q ^r ^s ^t ^u Standard R:1 — Reverse And 1st Gear Have The Same Ratio — The ideal reverse gear has the same transmission ratio as 1st gear no impairment when maneuvering especially when towing a trailer a torque converter can only partially compensate for this deficiency Plus 11.11 % minus 10 % compared to 1st gear is good Plus 25 % minus 20 % is acceptable (red) Above this is unsatisfactory (bold) ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ ^o ^p ^q ^r ^s ^t Standard 1:2 — Gear Step 1st To 2nd Gear As Small As Possible — With continuously decreasing gear steps (yellow marked line Step) the largest gear step is the one from 1st to 2nd gear, which for a good speed connection and a smooth gear shift must be as small as possible A gear ratio of up to 1.6667:1 (5:3) is good Up to 1.7500:1 (7:4) is acceptable (red) Above is unsatisfactory (bold) ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k From large to small gears (from right to left) ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ ^o ^p ^q ^r ^s ^t ^u ^v ^w ^x ^y ^z ^aa ^ab ^ac ^ad ^ae ^af ^ag ^ah ^ai ^aj ^ak ^al ^am ^an ^ao ^ap ^aq ^ar ^as ^at ^au ^av ^aw ^ax ^ay ^az ^ba ^bb ^bc ^bd ^be ^bf ^bg Standard STEP — From Large To Small Gears: Steady And Progressive Increase In Gear Steps — Gear steps should increase: Δ Step (first green highlighted line Δ Step) is always greater than 1 As progressive as possible: Δ Step is always greater than the previous step Not progressively increasing is acceptable (red) Not increasing is unsatisfactory (bold) ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ ^o ^p ^q ^r ^s ^t ^u ^v ^w ^x ^y ^z ^aa ^ab ^ac ^ad ^ae ^af ^ag ^ah ^ai ^aj ^ak ^al ^am Standard SPEED — From Small To Large Gears: Steady Increase In Shaft Speed Difference — Shaft speed differences should increase: Δ Shaft Speed (second line marked in green Δ (Shaft) Speed) is always greater than the previous one 1 difference smaller than the previous one is acceptable (red) 2 consecutive ones are a waste of possible ratios (bold) ^ See also Toyota A transmission ^ ^a ^b ^c ^d ^e ^f 36/44 and 44/96 or 27/33 and 33/72 ^ See also Toyota U transmission

UA 80E/F Failures And Problems

The UA 80E/F family of 8-speed transmissions has had some issues which led to class action lawsuits, a Customer Support Program and numerous technical service bulletins. Starting in 2017, some Highlander and Sienna customers starting complaining of harsh or delayed shifting, delayed acceleration, hesitation, jerking, unintended acceleration, lurching and excessive revving before upshifting.^[19]^[20]

Additional issues arose when 2017 and 2018 Highlander and Sienna customers experienced whining, master warning lights/check engine lights and transmission failures. This prompted Toyota to initiate a Customer Support Program (ZJC). This program covered certain 2017 and early 2018 built Highlanders and Sienna under specific VIN parameters and transmission build dates.^[21] However, this issue has been problematic beyond the scope of the ZJC program. This is causing out of pocket costs for customers outside of the standard 6 yrs./60K mls. powertrain warranty.^[22]

More whine or grind issues have been documented in 2021 Avalon, Camry and Highlanders equipped with the UA 80E/F transmission prompting T-SB-0008-21.^[23]

Applications

Longitudinal Engines

Toyota & Lexus: AA 80E

8-speed automatic RWD transmission.

2007–2017 Lexus LS 460
2008–2011 Lexus GS 460
2008–2014 Lexus IS F
2009–2013 Toyota Crown Majesta
2015–present Lexus RC F (3.133 final drive)^[14]
2016–2020 Lexus GS F (2.937 final drive)^[13]
2021–present Lexus IS 500 F Sport Performance (3.133 final drive)^[24]

Toyota & Lexus: AA 80F

8-speed automatic AWD transmission.

Lexus LS 460

Toyota & Lexus: AA 81E

Pairs with Toyota 2GR-FSE and 2GR-FKS V6 engines.

2014–2020 Lexus GS 350 (2.937 final drive)
2014–present Lexus IS 350 RWD (3.133 final drive)
2015–present Lexus RC 350
2013–present Toyota Crown Athlete

Aisin TL-80SN

2014–2019 Cadillac CTS (with a 2.85 final drive ratio)

Audi

2010–2015 Q7 1st generation (type 4L) 3.0 L TFSI · 3.6 L FSI · 4.2 L FSI^[16]
2010–2015 Q7 1st generation (type 4L) 3.0 L TDi^[17]
2010–2015 Q7 1st generation (type 4L) 4.2 L TDi^[18]

Hongqi

2019–2023 HS7 1st generationI^[16]
2023–present HS7 2nd generation^[16]

Porsche

2010–2017 Cayenne 2nd generation (type E2 92A) 3.0 L TFSI · 3.6 L FSI · 4.2 L FSI^[16]
2010–2018 Cayenne 2nd generation (type E2 92A) 3.0 L TDi^[17]
2010–2017 Cayenne 2nd generation (type E2 92A) 4.2 TDi · 4.8 L Turbo^[18]
2013–2017 Panamera 1st generation (type G1 970) facelift 3.0 L TDi^[18]

Volkswagen

2010–2018 Touareg 2nd generation (type 7P) 3.0 L TFSI · 3.6 L FSI · 4.2 L FSI^[16]
2010–2018 Touareg 2nd generation (type 7P) 3.0 L TDi^[17]
2010–2015 Touareg 2nd generation (type 7P) 4.2 L TDi^[18]

Transverse Engines

Toyota (UA 80E/F)

2018–present Toyota Avalon (non-hybrid engines)
2018–present Toyota Alphard/Vellfire
2018–present Toyota Camry (non-hybrid engines)
2017–2020 Toyota Sienna
2019–present Toyota RAV4 (non-hybrid)
2020–present Toyota Highlander/Grand Highlander
2024–present Toyota GR Yaris
2025–Toyota GR Corolla^[25]

Lexus (UA 80E/F)

2012–present Lexus RX (V6 AL10 F-Sport, AL20 & AL30 non Hybrids)
2018–present Lexus ES (non-hybrid engines)
2020–present Lexus LM (LM350)
2022–present Lexus NX (non-hybrid engines)
2024–present Lexus LBX (Morizo RR)

Toyota & Lexus (UB 80E/F)

2018–present Toyota Camry 2.5
2019–present Toyota RAV4 2.5
2012–2015 Lexus RX V6 F-Sport North America

Toyota & Lexus (UB 81E/F)

2016–present Lexus RX

BMW/MINI

2015–present BMW 2 Series Active Tourer (F45) and Gran Tourer (F46) with 4-cylinder engines
2016–present BMW X1 (F48) with 4-cylinder engines
2016–present Mini Clubman (F54) with 4-cylinder engines
2016–present Mini Countryman (F60) with 4-cylinder engines (and B38 with AWD)
2018–present Mini Cooper SD (F55/F56) and JCW (F56) due to torque output over 300Nm
2018–present BMW X2 (F39) with 4-cylinder engines
2019–present BMW 1 Series (F40) with 4-cylinder engines
2020–present BMW 2 Series Gran Coupé with 4-cylinder engines

Changan

2019–present Oshan COS1° GT
2019–present Changan CS85
2020–present Changan UNI-K
2021–present Changan UNI-V
2022–present Changan CS75

Chery

2023–present Chery Tiggo 9 (AWD)

Citroën

2017–present Citroën C5 Aircross
2018–present Citroën Grand C4 SpaceTourer
2019–present Citroën Berlingo
2020–present Citroën C4
2021–present Citroën C5 X

DS Automobiles

2018–present DS 7
2019–present DS 3
2020–present DS 9
2021–present DS 4

Exeed

2023–present Exeed Lanyue

Geely

2019–present Xingyue S/Xingyue L^[26]
2020–present Geely Xingrui

GM

2016 Chevrolet Malibu
2017 Buick LaCrosse^[27]
2017–2019 Cadillac XT5^[8]
2018–2020 Buick Regal TourX (I4 AWD only)

Jaguar

2020–present Jaguar E-Pace (1.5t 3-cylinder engines)

Land Rover

2020–present Discovery Sport (1.5t 3-cylinder engines)
2020–present Evoque (1.5t 3-cylinder engines)

Lynk & Co

2017–present 01
2018–present 03
2020–present 05^[28]
2021–present 02
2021–present 09

Mitsubishi

2017–present Mitsubishi Eclipse Cross (diesel engines)
2019–present Mitsubishi Delica (diesel engines)

Opel/Vauxhall

2017–present Opel Insignia
2017–present Opel Grandland X
2018–present Opel Combo
2020–present Opel Corsa
2020–present Opel Mokka
2021–present Opel Astra L^{[broken anchor]}

Peugeot

2017–present Peugeot 5008
2017–present Peugeot 308
2019–present Peugeot 3008 1.6 EAT8 & 2.0 EAT8
2018–present Peugeot 508 EAT8
2019–present Peugeot Rifter EAT8
2019–present Peugeot 208
2019–present Peugeot 2008
2022–present Peugeot 408

Polestar

2019–present Polestar 1

Škoda

2018–present Škoda Karoq (Australian market)
2020–present Škoda Octavia (some markets)

Volkswagen/MAN

2017–present Volkswagen Crafter and MAN TGE (transversely mounted engine only)
2018–present Volkswagen Tiguan (US version only)^[29]
2018–present Volkswagen Atlas (US version only)
2018–present Volkswagen Golf (US MK7 & MK8 in some markets)
2019–present Volkswagen Jetta (US version only)
2019–present Volkswagen Arteon (US version only)
2022–Volkswagen Taos (FWD models)^[30]

Volvo (TG-81SC/SD)

2014–2016 Volvo S80 II^[31]
2014–2016 Volvo V70 II^[32]
2014–2016 Volvo XC70 II
2014–2017 Volvo XC60
2015–2018 Volvo S60 II
2015–2018 Volvo V60
2014–present Volvo XC90 II^[33]
2016–present Volvo S90 II^[33]
2016–present Volvo V90 II^[33]
2016–present Volvo V40
2017–present Volvo XC60 II
2017–present Volvo XC40^[34]
2018–present Volvo V60 II^[6]
2018–present Volvo S60 III

References

^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ Masami Kondo · Yoshio Hasegawa · Yoji Takanami · Kenji Arai · Masaharu Tanaka · Masafumi Kinoshita (Toyota Motor Corp.) · Takeshi Ootsuki · Tetsuya Yamaguchi · Akira Fukatsu (Aisin AW Co., Ltd.) (2007-01-13). "Toyota AA80E 8-Speed Automatic Transmission with Novel Powertrain Control System · For Longitudinal Engines Only" (PDF). SAE Technical Paper Series. Retrieved 2024-11-01.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k Masahi Kito · Masaaki Nishida · Tomoko Nishida · Hiroshi Kato · Norihiro Tokunaga (2013-06-04). "Automatic Transmission · US-Patent No. 8,453,818 B2 · For Transverse Engines Only" (PDF). Retrieved 2024-11-01.
^ Arellano, Joel (2006-01-08). "Lexus LS 460: World Introduction". Autoblog. Retrieved 2009-02-13.
^ Aisin AW Co. "High Torque Capacity FWD 8-speed AT". www.aisin-aw.co.jp. Archived from the original on 2018-05-20. Retrieved 2018-05-19.
^ Toshihiko Aoki; Hiroshi Kato; Naoki Kato; Morise Masaru (2013-04-08). The World's First Transverse 8-Speed Automatic Transmission (Technical report). SAE International. doi:10.4271/2013-01-1274. 2013-01-1274.
^ ^a ^b "Volvo V60 prijslijst Modeljaar 2019" [Volvo V60 price list model year 2019] (PDF). volvo-tools-prd-media.s3.amazonaws.com (in Dutch). Volvo Cars Netherlands. July 2018. pp. 18–19. Archived (PDF) from the original on 2021-10-16. Retrieved 2018-07-14. File valid from 12 November 2018
^ Geord Bednarek (2016-12-02). "Der neue Insignia – im 8-Stufen Takt" [The new Insignia – with 8-step beat]. www.opel-blog.com (in German). Opel AG. Archived from the original on 2017-10-15. Retrieved 2017-12-29.
^ ^a ^b ^c "Cadillac XT5 Initiates New Series of Cadillac Luxury Crossovers" (PDF). media.cadillac.com (Press release). Cadillac. 2015-11-09. p. 12. Retrieved 2018-07-14. No archive due to robots.txt
^ "8 Speed Auto (US) Transmission and Torque Capacity".
^ "'The Year of More' for the 2017 Highlander with More Power, More Safety, and More Model Choices". 2016-09-27.
^ YouTube, a Google company. YouTube. Archived from the original on 2020-04-08.
^ ^a ^b Andrew Moskalik · Mark Stuhldreher · John Kargul (US Environmental Protection Agency) (2020-04-14). "Benchmarking a 2018 Toyota Camry UB80E Eight-Speed Automatic Transmission" (PDF). SAE International. Retrieved 2024-11-01.
^ ^a ^b ^c ^d ^e ^f "Lexus GS F Technical Specifications" (PDF). Retrieved 2023-03-03.
^ ^a ^b ^c ^d ^e ^f "Lexus RC F Technical Specifications" (PDF). Retrieved 2023-03-03.
^ "2016 LX 570 Product Information" (PDF). 2015. Retrieved 2024-11-01.
^ ^a ^b ^c ^d ^e ^f "Gearbox Aisin TR-80SD". gearboxlist.com. 3 April 2024. Retrieved 2024-11-01.
^ ^a ^b ^c ^d "Gearbox Aisin TR-81SD". gearboxlist.com. 3 April 2024. Retrieved 2024-11-01.
^ ^a ^b ^c ^d ^e "Gearbox Aisin TR-82SD". gearboxlist.com. 3 April 2024. Retrieved 2024-11-01.
^ "Toyota 8-Speed Transmission Problems Lead To Lawsuit". 2020-04-07.
^ "Morales v. Toyota Motor Sales, U.S.A., Inc". 2020-10-14.
^ "Customer Support Program Bulletin (ZJC): Repair Coverage For UA80 Transmission On Certain 2017-2018 MY Sienna And Certain 2017-2018 MY Highlander Vehicles" (PDF). 2019-04-18.
^ "Official 2017-2019 UA80 Transmission Whine Failure Thread". 2024-03-06.
^ "Whine or Grind Noise From the Transmission" (PDF). 2021-02-09.
^ "2022 IS Specifications" (PDF). Retrieved 2023-03-03.
^ https://www.toyota.com/grgarage/grcorolla/
^ "Test Drive Geely Xingyue Coupe SUV Review". 2019-05-29.
^ "All-New 2017 Buick LaCrosse is Here | TechLink". sandyblogs.com. Retrieved 2018-08-02.
^ "Lynk & Co. Reveals 05 coupe-like crossover". 2019-12-10.
^ Don Sherman (December 2016). "2018 Volkswagen Tiguan: We Finally Sample the U.S. Version". caranddriver.com.
^ "2022 Volkswagen Taos: What We Know So Far". 2021-04-21.
^ Chris Davies (2014-09-05). "2015 Volvo S80 D4 Geartronic SE Lux review – Updated Swedish Exec Gets Greener". carproductstested.com. Archived from the original on 2017-11-07. Retrieved 2017-12-28.
^ "Volvo V70 – model year 2014". www.media.volvocars.com. Volvo Car Corporation. 2013-05-13. Archived from the original on 2013-10-23. Retrieved 2017-12-28.
^ ^a ^b ^c Paul Weissler (2016-01-16). "Volvo's 2017 S90 has standard semi-autonomous driving system". articles.sae.org. SAE International. Archived from the original on 2017-10-17. Retrieved 2017-12-29.
^ Gary Witzenburg (2018-01-08). "2019 XC40 spearheads Volvo's new CMA platform". SAE International. Archived from the original on 2018-06-12. Retrieved 2018-06-08.

[longitudinal-1] See also Toyota A transmission

[transverse-3] See also Toyota U transmission

[15] Differences in gear ratios have a measurable, direct impact on vehicle dynamics, performance, waste emissions as well as fuel mileage

[18] Logically, the gearset concept (layout) provides for this 2nd reverse gear, but it will most likely not be used in the transmissions that the car manufacturers eventually bring to market. In some data sheets, the gear ratio of R2 is given, presumably a careless error^[1]^[13]^[14]

[longitudinal-19] See also Toyota A transmission

[transverse-20] See also Toyota U transmission

[21] Layout
Input and output are on opposite sides

Planetary gearset 1 is on the input (turbine) side

Input shafts are C₁ (planetary gear carrier of reversed gearset 1) and, if actuated, C₂ and C₃ (the compound planetary gear carrier of the Ravigneaux gearset)

Output shaft is R₃ (ring gear of outer Ravigneaux gearset)

[8] Input and output are on opposite sides

[9] Planetary gearset 1 is on the input (turbine) side

[10] Input shafts are C₁ (planetary gear carrier of reversed gearset 1) and, if actuated, C₂ and C₃ (the compound planetary gear carrier of the Ravigneaux gearset)

[11] Output shaft is R₃ (ring gear of outer Ravigneaux gearset)

[22] Total Ratio Span (Total Ratio Spread · Total Gear Ratio)
${\tfrac {i_{n}}{i_{1}}}$

A wider span enables the
downspeeding when driving outside the city limits

increase the climbing ability
when driving over mountain passes or off-road

or when towing a trailer

[13] ${\tfrac {i_{n}}{i_{1}}}$

[14] A wider span enables the
downspeeding when driving outside the city limits

increase the climbing ability
when driving over mountain passes or off-road

or when towing a trailer

[15] wnspeeding when driving outside the city limits

[16] rease the climbing ability
when driving over mountain passes or off-road

or when towing a trailer

[17] when driving over mountain passes or off-road

[18] r when towing a trailer

[23] Ratio Span's Center
$(i_{n}i_{1})^{\tfrac {1}{2}}$

The center indicates the speed level of the transmission

Together with the final drive ratio

it gives the shaft speed level of the vehicle

[20] $(i_{n}i_{1})^{\tfrac {1}{2}}$

[21] The center indicates the speed level of the transmission

[22] Together with the final drive ratio

[23] t gives the shaft speed level of the vehicle

[24] Average Gear Step
$({\tfrac {i_{n}}{i_{1}}})^{\tfrac {1}{n-1}}$

With decreasing step width
the gears connect better to each other

shifting comfort increases

[25] $({\tfrac {i_{n}}{i_{1}}})^{\tfrac {1}{n-1}}$

[26] With decreasing step width
the gears connect better to each other

shifting comfort increases

[27] the gears connect better to each other

[28] shifting comfort increases

[25] Sun 1: sun gear of gearset 1: reversed gearset

[26] Ring 1: ring gear of gearset 1 reversed gearset

[27] Sun 2: sun gear of gearset 2: inner Ravigneaux gearset

[28] Ring 2: ring gear of gearset 2: inner Ravigneaux gearset

[29] Sun 3: sun gear of gearset 3: outer Ravigneaux gearset

[30] Ring 3: ring gear of gearset 3: outer Ravigneaux gearset

[50:50-31] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ ^o ^p ^q ^r ^s ^t ^u ^v ^w ^x ^y ^z ^aa ^ab ^ac ^ad Standard 50:50
— 50 % Is Above And 50 % Is Below The Average Gear Step —
With steadily decreasing gear steps (yellow highlighted line Step)

and a particularly large step from 1st to 2nd gear
the lower half of the gear steps (between the small gears; rounded down, here the first 3) is always larger

and the upper half of the gear steps (between the large gears; rounded up, here the last 4) is always smaller

than the average gear step (cell highlighted yellow two rows above on the far right)

lower half: smaller gear steps are a waste of possible ratios (red bold)

upper half: larger gear steps are unsatisfactory (red bold)

[36] With steadily decreasing gear steps (yellow highlighted line Step)

[37] rticularly large step from 1st to 2nd gear
the lower half of the gear steps (between the small gears; rounded down, here the first 3) is always larger

and the upper half of the gear steps (between the large gears; rounded up, here the last 4) is always smaller

[38] the lower half of the gear steps (between the small gears; rounded down, here the first 3) is always larger

[39] the upper half of the gear steps (between the large gears; rounded up, here the last 4) is always smaller

[40] than the average gear step (cell highlighted yellow two rows above on the far right)

[41] wer half: smaller gear steps are a waste of possible ratios (red bold)

[42] upper half: larger gear steps are unsatisfactory (red bold)

[R2-32] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ Logically, the gearset concept (layout) provides for this 2nd reverse gear, but it will most likely not be used in the transmissions that the car manufacturers eventually bring to market. In some data sheets, the gear ratio of R2 is given, presumably a careless error^[1]^[13]^[14]

[R:1-33] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ ^o ^p ^q ^r ^s ^t ^u Standard R:1
— Reverse And 1st Gear Have The Same Ratio —
The ideal reverse gear has the same transmission ratio as 1st gear
no impairment when maneuvering

especially when towing a trailer

a torque converter can only partially compensate for this deficiency

Plus 11.11 % minus 10 % compared to 1st gear is good

Plus 25 % minus 20 % is acceptable (red)

Above this is unsatisfactory (bold)

[45] The ideal reverse gear has the same transmission ratio as 1st gear
no impairment when maneuvering

especially when towing a trailer

a torque converter can only partially compensate for this deficiency

[46] rment when maneuvering

[47] specially when towing a trailer

[48] torque converter can only partially compensate for this deficiency

[49] Plus 11.11 % minus 10 % compared to 1st gear is good

[50] Plus 25 % minus 20 % is acceptable (red)

[51] Above this is unsatisfactory (bold)

[1:2-34] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ ^o ^p ^q ^r ^s ^t Standard 1:2
— Gear Step 1st To 2nd Gear As Small As Possible —
With continuously decreasing gear steps (yellow marked line Step)

the largest gear step is the one from 1st to 2nd gear, which
for a good speed connection and

a smooth gear shift

must be as small as possible
A gear ratio of up to 1.6667:1 (5:3) is good

Up to 1.7500:1 (7:4) is acceptable (red)

Above is unsatisfactory (bold)

[53] With continuously decreasing gear steps (yellow marked line Step)

[54] the largest gear step is the one from 1st to 2nd gear, which
for a good speed connection and

a smooth gear shift

[55] r a good speed connection and

[56] smooth gear shift

[57] ust be as small as possible
A gear ratio of up to 1.6667:1 (5:3) is good

Up to 1.7500:1 (7:4) is acceptable (red)

Above is unsatisfactory (bold)

[58] A gear ratio of up to 1.6667:1 (5:3) is good

[59] Up to 1.7500:1 (7:4) is acceptable (red)

[60] Above is unsatisfactory (bold)

[LS-35] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k From large to small gears (from right to left)

[step-36] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ ^o ^p ^q ^r ^s ^t ^u ^v ^w ^x ^y ^z ^aa ^ab ^ac ^ad ^ae ^af ^ag ^ah ^ai ^aj ^ak ^al ^am ^an ^ao ^ap ^aq ^ar ^as ^at ^au ^av ^aw ^ax ^ay ^az ^ba ^bb ^bc ^bd ^be ^bf ^bg Standard STEP
— From Large To Small Gears: Steady And Progressive Increase In Gear Steps —
Gear steps should
increase: Δ Step (first green highlighted line Δ Step) is always greater than 1

As progressive as possible: Δ Step is always greater than the previous step

Not progressively increasing is acceptable (red)

Not increasing is unsatisfactory (bold)

[63] Gear steps should
increase: Δ Step (first green highlighted line Δ Step) is always greater than 1

As progressive as possible: Δ Step is always greater than the previous step

[64] increase: Δ Step (first green highlighted line Δ Step) is always greater than 1

[65] As progressive as possible: Δ Step is always greater than the previous step

[66] Not progressively increasing is acceptable (red)

[67] Not increasing is unsatisfactory (bold)

[speed-37] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ ^o ^p ^q ^r ^s ^t ^u ^v ^w ^x ^y ^z ^aa ^ab ^ac ^ad ^ae ^af ^ag ^ah ^ai ^aj ^ak ^al ^am Standard SPEED
— From Small To Large Gears: Steady Increase In Shaft Speed Difference —
Shaft speed differences should
increase: Δ Shaft Speed (second line marked in green Δ (Shaft) Speed) is always greater than the previous one

1 difference smaller than the previous one is acceptable (red)

2 consecutive ones are a waste of possible ratios (bold)

[69] Shaft speed differences should
increase: Δ Shaft Speed (second line marked in green Δ (Shaft) Speed) is always greater than the previous one

[70] increase: Δ Shaft Speed (second line marked in green Δ (Shaft) Speed) is always greater than the previous one

[71] 1 difference smaller than the previous one is acceptable (red)

[72] 2 consecutive ones are a waste of possible ratios (bold)

[38] See also Toyota A transmission

[4or3-42] ^ ^a ^b ^c ^d ^e ^f 36/44 and 44/96 or 27/33 and 33/72

[44] See also Toyota U transmission

[longitudinal-2] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ Masami Kondo · Yoshio Hasegawa · Yoji Takanami · Kenji Arai · Masaharu Tanaka · Masafumi Kinoshita (Toyota Motor Corp.) · Takeshi Ootsuki · Tetsuya Yamaguchi · Akira Fukatsu (Aisin AW Co., Ltd.) (2007-01-13). "Toyota AA80E 8-Speed Automatic Transmission with Novel Powertrain Control System · For Longitudinal Engines Only" (PDF). SAE Technical Paper Series. Retrieved 2024-11-01.

[transverse-4] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k Masahi Kito · Masaaki Nishida · Tomoko Nishida · Hiroshi Kato · Norihiro Tokunaga (2013-06-04). "Automatic Transmission · US-Patent No. 8,453,818 B2 · For Transverse Engines Only" (PDF). Retrieved 2024-11-01.

[5] Arellano, Joel (2006-01-08). "Lexus LS 460: World Introduction". Autoblog. Retrieved 2009-02-13.

[6] Aisin AW Co. "High Torque Capacity FWD 8-speed AT". www.aisin-aw.co.jp. Archived from the original on 2018-05-20. Retrieved 2018-05-19.

[7] Toshihiko Aoki; Hiroshi Kato; Naoki Kato; Morise Masaru (2013-04-08). The World's First Transverse 8-Speed Automatic Transmission (Technical report). SAE International. doi:10.4271/2013-01-1274. 2013-01-1274.

[V60_2_NL_MY19-8] "Volvo V60 prijslijst Modeljaar 2019" [Volvo V60 price list model year 2019] (PDF). volvo-tools-prd-media.s3.amazonaws.com (in Dutch). Volvo Cars Netherlands. July 2018. pp. 18–19. Archived (PDF) from the original on 2021-10-16. Retrieved 2018-07-14. File valid from 12 November 2018

[9] Geord Bednarek (2016-12-02). "Der neue Insignia – im 8-Stufen Takt" [The new Insignia – with 8-step beat]. www.opel-blog.com (in German). Opel AG. Archived from the original on 2017-10-15. Retrieved 2017-12-29.

[XT5_F45-10] "Cadillac XT5 Initiates New Series of Cadillac Luxury Crossovers" (PDF). media.cadillac.com (Press release). Cadillac. 2015-11-09. p. 12. Retrieved 2018-07-14. No archive due to robots.txt

[11] "8 Speed Auto (US) Transmission and Torque Capacity".

[12] "'The Year of More' for the 2017 Highlander with More Power, More Safety, and More Model Choices". 2016-09-27.

[13] YouTube, a Google company. YouTube. Archived from the original on 2020-04-08.

[Camry-14] Andrew Moskalik · Mark Stuhldreher · John Kargul (US Environmental Protection Agency) (2020-04-14). "Benchmarking a 2018 Toyota Camry UB80E Eight-Speed Automatic Transmission" (PDF). SAE International. Retrieved 2024-11-01.

[GSF-16] ^ ^a ^b ^c ^d ^e ^f "Lexus GS F Technical Specifications" (PDF). Retrieved 2023-03-03.

[RCF-17] ^ ^a ^b ^c ^d ^e ^f "Lexus RC F Technical Specifications" (PDF). Retrieved 2023-03-03.

[39] "2016 LX 570 Product Information" (PDF). 2015. Retrieved 2024-11-01.

[TR-80SD-40] ^ ^a ^b ^c ^d ^e ^f "Gearbox Aisin TR-80SD". gearboxlist.com. 3 April 2024. Retrieved 2024-11-01.

[TR-81SD-41] "Gearbox Aisin TR-81SD". gearboxlist.com. 3 April 2024. Retrieved 2024-11-01.

[TR-82SD-43] "Gearbox Aisin TR-82SD". gearboxlist.com. 3 April 2024. Retrieved 2024-11-01.

[45] "Toyota 8-Speed Transmission Problems Lead To Lawsuit". 2020-04-07.

[46] "Morales v. Toyota Motor Sales, U.S.A., Inc". 2020-10-14.

[47] "Customer Support Program Bulletin (ZJC): Repair Coverage For UA80 Transmission On Certain 2017-2018 MY Sienna And Certain 2017-2018 MY Highlander Vehicles" (PDF). 2019-04-18.

[48] "Official 2017-2019 UA80 Transmission Whine Failure Thread". 2024-03-06.

[49] "Whine or Grind Noise From the Transmission" (PDF). 2021-02-09.

[50] "2022 IS Specifications" (PDF). Retrieved 2023-03-03.

[51] ttps://www.toyota.com/grgarage/grcorolla/

[52] "Test Drive Geely Xingyue Coupe SUV Review". 2019-05-29.

[53] "All-New 2017 Buick LaCrosse is Here | TechLink". sandyblogs.com. Retrieved 2018-08-02.

[54] "Lynk & Co. Reveals 05 coupe-like crossover". 2019-12-10.

[55] Don Sherman (December 2016). "2018 Volkswagen Tiguan: We Finally Sample the U.S. Version". caranddriver.com.

[56] "2022 Volkswagen Taos: What We Know So Far". 2021-04-21.

[57] Chris Davies (2014-09-05). "2015 Volvo S80 D4 Geartronic SE Lux review – Updated Swedish Exec Gets Greener". carproductstested.com. Archived from the original on 2017-11-07. Retrieved 2017-12-28.

[58] "Volvo V70 – model year 2014". www.media.volvocars.com. Volvo Car Corporation. 2013-05-13. Archived from the original on 2013-10-23. Retrieved 2017-12-28.

[SAE_SPA_90-59] Paul Weissler (2016-01-16). "Volvo's 2017 S90 has standard semi-autonomous driving system". articles.sae.org. SAE International. Archived from the original on 2017-10-17. Retrieved 2017-12-29.

[60] Gary Witzenburg (2018-01-08). "2019 XC40 spearheads Volvo's new CMA platform". SAE International. Archived from the original on 2018-06-12. Retrieved 2018-06-08.

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