| ZF 8HP | |
|---|---|
 Automatic Transmission 8HP 70 | |
| Overview | |
| Manufacturer | ZF Friedrichshafen |
| Production | 2008–present |
| Body and chassis | |
| Class | 8-speed automatic transmission |
| Related | GM 8L · Aisin-Toyota 8-speed · MB 9G-Tronic · ZF 9HP |
| Chronology | |
| Predecessor | ZF 6HP |
8HP is ZF Friedrichshafen AG's trademark name for its 8-speed automatic transmission models with hydraulic converter and planetary gearsets for longitudinal engine applications. Designed and first built by ZF's subsidiary in Saarbrücken, Germany, it debuted in 2008 on the BMW 7 Series (F01) 760Li sedan fitted with the V12 engine. BMW remains a major customer for the transmission.
Another major customer is Stellantis, who both received a license to produce the transmission and set up a joint-venture plant with ZF. Stellantis has built the transmission at its Kokomo Transmission plant since 2013 under their own brand name, the Torqueflite 8.[1][2] The joint venture plant in Gray Court, South Carolina opened in 2012.[3]
The 8HP is the first transmission to use this 8-speed gearset concept. In the meantime it has become the new benchmark for automatic transmissions.
The GM 8L transmission is based on the same globally patented gearset concept. While fully retaining the gearset logic, it differs from this only in the patented[4] arrangement of the components with gearsets 1 and 3 swapped.[5]
Gear Model
|
R | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | Total Span |
Span Center |
Avg. Step |
Compo- nents |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2008: Pilot Series | 4 Gearsets 2 Brakes 3 Clutches | ||||||||||||
| 8HP 70 | −3.297 | 4.696 | 3.130 | 2.104 | 1.667 | 1.285 | 1.000 | 0.839 | 0.667 | 7.043 | 1.769 | 1.322 | |
| 2010: 1st Generation | |||||||||||||
| 8HP 30/I · 8HP 45 | −3.295 | 4.714 | 3.143 | 2.106 | 1.667 | 1.285 | 1.000 | 0.839 | 0.667 | 7.071 | 1.773 | 1.322 | |
| 8HP 55 · 8HP 70 8HP 65 · 8HP 90 |
−3.317 | 4.714 | 3.143 | 2.106 | 1.667 | 1.285 | 1.000 | 0.839 | 0.667 | 7.071 | 1.773 | 1.322 | |
| 2014: 2nd Generation | |||||||||||||
| 8HP 75/I | −3.317 | 4.714 | 3.143 | 2.106 | 1.667 | 1.285 | 1.000 | 0.839 | 0.667 | 7.071 | 1.773 | 1.322 | |
| 8HP 30/II · 8HP 50 | −3.456 | 5.000 | 3.200 | 2.143 | 1.720 | 1.314 | 1.000 | 0.822 | 0.640 | 7.813 | 1.789 | 1.341 | |
| 8HP 75/II · 8HP 95 | −3.478 | 5.000 | 3.200 | 2.143 | 1.720 | 1.313 | 1.000 | 0.823 | 0.640 | 7.813 | 1.789 | 1.341 | |
| 2018: 3rd Generation | |||||||||||||
| 8HP 76/I | −3.478 | 5.000 | 3.200 | 2.143 | 1.720 | 1.313 | 1.000 | 0.823 | 0.640 | 7.813 | 1.789 | 1.341 | |
| 8HP 30/III · 8HP 51 | −3.712 | 5.250 | 3.360 | 2.172 | 1.720 | 1.316 | 1.000 | 0.822 | 0.640 | 8.203 | 1.833 | 1.351 | |
| 8HP 76/II | −3.993 | 5.500 | 3.520 | 2.200 | 1.720 | 1.317 | 1.000 | 0.823 | 0.640 | 8.594 | 1.876 | 1.360 | |
| 2022: 4th Generation | |||||||||||||
| 8HP 100 | −3.968 | 5.000 | 3.200 | 2.143 | 1.720 | 1.297 | 1.000 | 0.833 | 0.640 | 7.813 | 1.789 | 1.341 | |
| 8HP 80 | −4.544 | 5.500 | 3.520 | 2.200 | 1.720 | 1.301 | 1.000 | 0.833 | 0.640 | 8.594 | 1.876 | 1.360 | |
| 2016: Racing Cars | |||||||||||||
| 8P 45R | TBD | TBD | TBD | TBD | TBD | TBD | 1.000 | TBD | TBD | 4.200 | TBD | 1.228 | |
| 2017: Commercial Vehicles | |||||||||||||
| 8AP 600 T · 8AP 1000 T 8AP 800 T · 8AP 1200 T |
−4.250 | 4.889 | 3.123 | 2.033 | 1.639 | 1.254 | 1.000 | 0.840 | 0.639 | 7.652 | 1.767 | 1.337 | |
| 8AP 1200 S | −3.757 | 4.889 | 3.123 | 2.033 | 1.639 | 1.268 | 1.000 | 0.830 | 0.639 | 7.652 | 1.767 | 1.337 | |
| |||||||||||||
- ^ Duane, Salerno (25 April 2019). "Reviewed: Chrysler Group's 8 speed automatic transmission". salernoduanesummit.com. Retrieved 10 May 2019.
- ^ "Ram ZF 8 Speed Automatic Transmission TorqueFlite 8 ZF 8HP70". 29 September 2014. Archived from the original on 15 December 2021. Retrieved 10 May 2019 – via YouTube.
- ^ "ZF and Chrysler Reach Agreement for new 8-Speed Automatic Transmissions". Retrieved 10 June 2010.
- ^ "US Patent 8,105,196 B2: Automatic Transmission Gear And Clutch Arrangement" (PDF). US Patent Office. 31 January 2012. Retrieved 18 November 2024.
- ^ Apakidze, Timur (11 March 2014). "Saturation Dive: ZF 8-Speed Automatic". TTAC: The Truth About Cars · Pt. 1. Retrieved 7 July 2019. and "loc. cit. · Pt. 2". 23 April 2014. Retrieved 18 November 2024.