Wikipedia

Aisin–Toyota 8-speed automatic transmission

(Redirected from Aisin AWF8F35)

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

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
ManufacturerToyota · Aisin AW
Also calledBMW/Mini GA 8F 22AW
Volvo TG-81SC/SD
GM AW F8 F45 & AF50-8
VW AQ 450
PSA EAT8
Production2006–present
Body and chassis
Class8-speed automatic transmission
Related ZF 8HP · GM 8L · ZF 9HP
Chronology
PredecessorAWTF-80 SC transmission

Key data

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Gear ratios[c]
Aisin Toyota First
Deliv-
ery		 Gear Total Span Avg.
Step		 Components Nomenclature
R2[d] R1 1 2 3 4 5 6 7 8 Nomi-
nal		 Effec-
tive		 Cen-
ter		 Total per
Gear[e]		 Instal-
lation		 Drive Gears
Count		 Maximum Input Torque
Longitudinal engines[a][1] 3
Gearsets
2
Brakes
4
Clutches		 1.125
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 5.920 1.775 1.312 A[f] A[g]
B[h]		 8[e] 550 N⋅m (406 lb⋅ft)
— 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 5.630 1.796 1.324 550 N⋅m (406 lb⋅ft)[5]
TR-80SD AE 80E/F 2010 −2.053 −3.825 4.845 2.8404 1.864 1.4369 1.217 1.000 0.816 0.672 7.206 5.689 1.805 1.326 550 N⋅m (406 lb⋅ft)[6]
TR-81SD — 2010 −2.182 −4.066 4.970 2.8398 1.864 1.4370 1.210 1.000 0.825 0.686 7.247 5.930 1.846 1.327 600 N⋅m (443 lb⋅ft)[7]
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 5.869 1.836 1.325 850 N⋅m (627 lb⋅ft)[8]
— 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 5.596 1.696 1.314 TBD
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 6.271 1.927 1.351 U[i] A[j]
B[h]		 8[e] 380 N⋅m (280 lb⋅ft)[9][10]
AW F8 F35 UB 80E/F 2016 −2.059 −4.015 5.250 3.029 1.950 1.457 1.221 1.000 0.809 0.673 7.800 5.965 1.880 1.341 280 N⋅m (207 lb⋅ft)[10][11]
TG-80LS UB 80E/F 2017 −2.053 −4.003 5.070 2.972 1.950 1.4698 1.231 1.000 0.808 0.672 7.540 5.953 1.846 1.335 350 N⋅m (258 lb⋅ft)
TBD TBD TBD −2.182 −4.255 5.200 2.971 1.950 1.4700 1.224 1.000 0.817 0.686 7.583 6.205 1.888 1.336 TBD
  1. 1 2 3 See also Toyota A transmission
  2. 1 2 3 See also Toyota U transmission
  3. ↑ Differences in gear ratios have a measurable, direct impact on vehicle dynamics, performance, waste emissions as well as fuel mileage
  4. ↑ 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][3][4]
  5. 1 2 3 Forward gears only
  6. ↑ Longitudinal engine
  7. ↑ Rear-wheel drive
  8. 1 2 Four-wheel drive
  9. ↑ Transverse engine
  10. ↑ Front-wheel drive

History

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2006: Aisin TL-80SN for longitudinal engines

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The Aisin TL-80SN (Toyota AA 80E/AA 80F/AA 81E) series is the world's first 8-speed automatic transmission for passenger cars.[12] It is designed for longitudinal engines[a][1] and was first used in the 2007 model year Lexus LS 460.[13]

2016: Aisin AW F8 for transverse engines

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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 planetary gearset-based 6-speed transmissions to increase the overall ratio spread, reduce gear steps, and increase the torque capacity for transverse engine vehicles as well.[14]

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.[15] It is also called EAT8 (PSA), GA 8F 22AW (BMW/Mini), TG-81SC (Volvo),[16] AF50-8 (Opel/Vauxhall),[17] AW F8 F45 (Cadillac),[9] and AQ 450 (Volkswagen Group).[18]

Toyota

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Toyota’s marketing name for the transmission is "Direct Shift – 8AT 8-speed automatic transmission".[19][20] 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 and rated for 380 N⋅m (280 lb⋅ft).[10] 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 280 N⋅m (207 lb⋅ft).[10][11]

Drivetrain

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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

Planetary gearset concept

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Uniquely compact gearset design

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Among all 7-, 8-, 9-, and 10-speed automatic transmissions, it is the only one that requires just three gearsets, making it so compact that it is suitable for both engine installations.[a][1][b][2]

Improved fuel economy

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The main objective in replacing the predecessor model was to improve vehicle fuel economy with extra speeds and a wider gear span to allow the engine speed level to be lowered (downspeeding), which is a decisive factor in improving energy efficiency and thus reducing fuel consumption. In addition, the lower engine speed level improves the noise-vibration-harshness comfort and the exterior noise is reduced. 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.

Reduced manufacturing complexity

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In order to avoid a further increase in manufacturing complexity while expanding the number of gear ratios, Aisin switched from the conventional design method—in which the planetary gearset concept was limited to a purely serial or in-line power flow—to a more modern design method that utilizes a planetary gearset concept with combined parallel and serial power flow. This was only possible thanks to computer-aided design and has resulted in a globally patented gearset concept. After gaining additional gear ratios only with additional components, this time the number of components has to decrease while the number of ratios still increase. The resulting progress is reflected in a much better ratio of the number of gears to the number of components used compared to existing layouts.

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 by 50%. Aluminum has also replaced steel on gear tooth surfaces. Shift times are as low as 0.35 seconds or 41% faster than the previous LS 430's unit.

Two reverse gears

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The gearset concept offers two 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][3][4]

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.

Quality

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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.

UA 80E/F failures and problems

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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.[21][22]

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.[23] 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.[24]

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.[25]

In December 2024, Gears Magazine published an article which has a more in depth look at some of the UA80's shortcomings. This includes a nut which retains the races that comes loose and allows the transfer gear to move. Another common issue is fluid contamination due to clutch debris from the torque converter.[26]

Applications

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Variants and applications
Model Car Model[c]
Longitudinal engines
AA 80E[d]
AA 80F[e]
AA 81E[f]
AE 80F[g]
AL 80E/F[h][i]
TL-80SN[j]
  • 2014–2019 Cadillac CTS (with a 2.85 final drive ratio)
  • 2010–2015 Audi Q7 1st generation (type 4L) 3.0 L TFSI · 3.6 L FSI · 4.2 L FSI[6]
  • 2010–2015 Audi Q7 1st generation (type 4L) 3.0 L TDi[7]
  • 2010–2015 Audi Q7 1st generation (type 4L) 4.2 L TDi[8]
  • 2019–2023 Hongqi HS7 1st generationI[6]
  • 2023–present Hongqi HS7 2nd generation[6]
TR-80SD[k]
Transverse engines
UA 80E/F[l][m]
UC 80E/F[n][o]
UA 80E/F[l][m]
  • 2012–present Lexus RX (V6 AL10 F-Sport, AL20 & AL30 non Hybrids)
  • 2018–present Lexus ES (non-hybrid engines)
  • 2020–2023 Lexus LM (LM350)
  • 2022–present Lexus NX (non-hybrid engines)
  • 2024–present Lexus LBX (Morizo RR)
UB 80E/F[p][q]
UB 81E/F[r][s]
TG-81SC/SD[t][u]
  1. 1 2 3 4 5 6 See also Toyota A transmission
  2. 1 2 3 4 5 6 7 See also Toyota U transmission
  3. ↑ without any claim of completeness
  4. ↑ AA 80E: RWD Toyota A transmission for Toyota & Lexus
  5. ↑ AA 80F: AWD Toyota A transmission for Toyota & Lexus
  6. ↑ AA 81E: RWD Toyota A transmission that pairs with Toyota 2GR-FSE and 2GR-FKS V6 engines
  7. ↑ AE 80F: AWD Toyota A transmission for Toyota & Lexus
  8. ↑ AL 80E: RWD Toyota A transmission for Toyota & Lexus
  9. ↑ AL 80F: AWD Toyota A transmission for Toyota & Lexus
  10. ↑ TL-80SN: FWD Aisin transmission for other manufacturer
  11. ↑ TR-80SD: AWD Aisin transmission for Porsche & Volkswagen
  12. 1 2 UA 80E: FWD Toyota U transmission for Toyota & Lexus
  13. 1 2 UA 80F: AWD Toyota U transmission for Toyota & Lexus
  14. ↑ UA 80E: FWD Toyota U transmission for Toyota
  15. ↑ UA 80F: AWD Toyota U transmission for Toyota
  16. ↑ UB 80E: FWD Toyota U transmission for Toyota & Lexus
  17. ↑ UB 80F: AWD Toyota U transmission for Toyota & Lexus
  18. ↑ UB 81E: FWD Toyota U transmission for Lexus & other manufacturer
  19. ↑ UB 81F: AWD Toyota U transmission for Lexus & other manufacturer
  20. ↑ TG 81SC: FWD Aisin transmission for Volvo
  21. ↑ TG 81SD: AWD Aisin transmission for Volvo

See also

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References

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  1. 1 2 3 4 5 6 7 8 9 10 11 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.
  2. 1 2 3 4 5 6 7 8 9 10 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.
  3. 1 2 3 "Lexus GS F Technical Specifications" (PDF). Retrieved 2023-03-03.
  4. 1 2 3 "Lexus RC F Technical Specifications" (PDF). Retrieved 2023-03-03.
  5. ↑ "2016 LX 570 Product Information" (PDF). 2015. Retrieved 2024-11-01.
  6. 1 2 3 4 5 6 "Gearbox Aisin TR-80SD". gearboxlist.com. 3 April 2024. Retrieved 2024-11-01.
  7. 1 2 3 4 "Gearbox Aisin TR-81SD". gearboxlist.com. 3 April 2024. Retrieved 2024-11-01.
  8. 1 2 3 4 5 "Gearbox Aisin TR-82SD". gearboxlist.com. 3 April 2024. Retrieved 2024-11-01.
  9. 1 2 3 "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
  10. 1 2 3 4 Ryohei Imanishi · Daisuke Kusamoto · Hiroomi Toi · Nobukazu Ike · Takashi Yasuda · Masahiro Ito (Toyota Motor Corporation) (2018-09-01). "Development of New Front-Wheel Drive Direct-Shift 8-Speed Automatic Transaxle · Toyota Technical Review No. 64 (2018) pp. 54–61 · For Transverse Engines Only" (PDF). Retrieved 2025-11-16.
  11. 1 2 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.
  12. ↑ Arellano, Joel (2006-01-08). "Lexus LS 460: World Introduction". Autoblog. Retrieved 2009-02-13.
  13. ↑ Ota, Hirofumi; Nozaki, Kazutoshi; Honda, Atsushi; Kinoshita, Masafumi; Aoki, Toshihiko; Todo, Minoru; Iwase, Mikio (2007-04-16). "Toyota's World First 8-Speed Automatic Transmission for Passenger Cars". SAE Technical Paper. SAE Technical Paper Series. 1 2007-01-1101. doi:10.4271/2007-01-1101. JSTOR 44699309 – via JSTOR.
  14. ↑ 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.
  15. ↑ 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.
  16. 1 2 "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
  17. ↑ 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.
  18. ↑ "8 Speed Auto (US) Transmission and Torque Capacity".
  19. ↑ "'The Year of More' for the 2017 Highlander with More Power, More Safety, and More Model Choices". 2016-09-27.
  20. ↑ YouTube, a Google company. YouTube. Archived from the original on 2020-04-08.
  21. ↑ "Toyota 8-Speed Transmission Problems Lead To Lawsuit". 2020-04-07.
  22. ↑ "Morales v. Toyota Motor Sales, U.S.A., Inc". 2020-10-14. Archived from the original on May 19, 2023.
  23. ↑ "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.
  24. ↑ "Official 2017-2019 UA80 Transmission Whine Failure Thread". 2024-03-06.
  25. ↑ "Whine or Grind Noise From the Transmission" (PDF). 2021-02-09.
  26. ↑ "Gears Magazine - The Toyota UA80 - Worth Another Look". Gears Magazine. Retrieved 2025-02-03.
  27. ↑ "2022 IS Specifications" (PDF). Retrieved 2023-03-03.
  28. ↑ https://www.toyota.com/grgarage/grcorolla/
  29. ↑ "Toyota GR Yaris Spec Table March 2025" (PDF). Toyota Australia. Toyota Motor Corporation Australia Limited. 2025-03-14. Archived (PDF) from the original on 2025-05-29. Retrieved 2025-11-02.
  30. ↑ "Toyota GR Corolla Spec Table January 2025" (PDF). Toyota Australia. Toyota Motor Corporation Australia Limited. 2025-01-24. Archived (PDF) from the original on 2025-05-29. Retrieved 2025-11-02.
  31. ↑ "Test Drive Geely Xingyue Coupe SUV Review". 2019-05-29.
  32. ↑ "All-New 2017 Buick LaCrosse is Here | TechLink". sandyblogs.com. Retrieved 2018-08-02.
  33. ↑ "Lynk & Co. Reveals 05 coupe-like crossover". 2019-12-10.
  34. ↑ Don Sherman (December 2016). "2018 Volkswagen Tiguan: We Finally Sample the U.S. Version". caranddriver.com.
  35. ↑ "2022 Volkswagen Taos: What We Know So Far". 2021-04-21.
  36. ↑ 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.
  37. ↑ "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.
  38. 1 2 3 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.
  39. ↑ 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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