ZF 8HP transmission

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ZF Stufenautomatgetriebe 8HP70.jpg
Automatic Transmission 8HP70
ManufacturerZF Friedrichshafen
Body and chassis
Class8-speed longitudinal automatic transmission
PredecessorZF 6HP transmission

The ZF 8HP is an eight-speed automatic transmission designed and built by ZF Friedrichshafen.[1] It had its debut in the BMW 7 Series (F01) 760Li saloon fitted with the V12 engine, and since then each new BMW model in all Series down to the 1 Series in rear-wheel-drive and all-wheel-drive versions have been equipped with it.

One of its main aims is to improve vehicle fuel economy, and it can achieve an 11% saving compared to the ZF 6-speed transmission and 14% versus modern 5-speed transmissions.[2][3] Due to changes in internal design, the shift times have reduced to 200 milliseconds; additionally, the unit brings the ability to shift in a non-sequential manner - going from gear 8 to gear 2 in extreme situations.[4] In the 8HP70 version, it has a torque handling limit of 700 newton metres (516 lbf⋅ft), and weighs 87 kilograms (192 lb).[5]

Future development will see two four-wheel drive versions available, with a version destined for Volkswagen Group applications using a Torsen centre differential.[6] It will be able to encompass a torque range from 300 newton metres (221 lbf⋅ft) to 1,000 newton metres (738 lbf⋅ft), and will be available for use in middle-class cars through to large luxury sport utility vehicles.[6]

Chrysler Group LLC initially received the 8HP 8-speed automatic transmissions from the ZF plant in Saarbrucken, Germany. By 2013, in parallel with Chrysler Group, ZF had set up a new transmission production plant in Gray Court, South Carolina.[7] ZF Friedrichshafen and Chrysler Group have reached a supply and license agreement for the 8HP. Chrysler Group is licensed to produce the 8HP at the company’s Kokomo Transmission Plant and the Kokomo Casting plant, production began in 2013.This transmission is marketed by Chrysler under their own brand name, the Torqueflite 8.[8][9]

2nd generation 8HP products were released starting in 2014. Efficiency improvements over the original design include a wider ratio spread of 7.8:1, reduced drag torque from the shift elements, reduction in required oil pump pressure, and broadened use of the coasting and start-stop systems.[10] ZF estimated fuel economy improvement over 1st generation 8HP kits to be 3%. Refinements were also made with respect to vibration.

3rd generation 8HP products were released starting in 2018. Major improvments are total spread of 8.6 and a fuel economy improvement of 2.5% compared to the 2nd generation. There are several options in maximum torque available, also the gearbox is available with mild hybrid and plug in hybrid options: With 15 kW and 200 NM supporting boosting and repueration in combination with 48 Volt technology up to 90 kw and 250 NM for usage with higher voltage. [11]

Gear ratios[edit]

Below is a table of reference gear ratios as provided with the ZF 8HP transmission, though actual implementations may differ depending on the tuning and specifications of individual vehicle manufacturers such as BMW and Audi. Differences in gear ratios have a measurable, direct impact on vehicle dynamics, performance, waste emissions as well as fuel mileage.

Generation (first delivery) Total spread 1 2 3 4 5 6 7 8 R
1st generation (2009) 7.1 4.714 3.143 2.106 1.667 1.285 1.000 0.839 0.667 3.300
2nd generation (2014) 7.8 5.000 3.200 2.143 1.720 1.314 1.000 0.822 0.640 3.456
3rd generation (2018) 8.6 n/a n/a n/a n/a n/a 1.000 n/a n/a n/a

List of ZF 8HP variants[edit]

Name Max. gasoline torque (N·m) Max. diesel torque (N·m) Application examples
8HP30 300 300 -
8HP45 (a separate 845RE is for V6 Chryslers)[12] 450 500 BMW 1 Series (F20), BMW 2 Series M235i (F22), BMW 3 Series (F30), BMW 5 Series (F10/F11), BMW X3 (F25), BMW X4 (F26), BMW X5 35i (E70), BMW X5 (F15, BMW X6 (F16), Chrysler 300 V6, Chrysler 300 C, Dodge Charger V6, Dodge Durango V6 (2014-2017), RAM 1500 V6 (2013- ), Jaguar XE, Lancia Thema V6, Volkswagen Amarok
8HP50 (2nd Generation; a separate 850RE is for V6 Chryslers)[13] 500 500 Alfa Romeo Giulia, Alfa Romeo Stelvio, BMW 1 Series (F20 LCI), BMW 2 Series M240i (F22), BMW 3 Series (F30 LCI), BMW 5 Series (F10), BMW 7 Series (G11), Dodge Durango V6 (2017-), Jeep Wrangler/Wrangler Unlimited (JL) ,BMW X3 20D(G01), BMW X3 30i(G01), BMW X3 M40i(G01)
8HP55 550 550 Audi A4 (B8.5), Audi A6 (C7), Audi A8 and A8L (D4), Audi Q5, Audi Q7
8HP70 700 700 BMW 7 Series (F01), BMW X5 50i (E70), BMW 5 series (F10/11), BMW 3 Series (F30) 335d, Dodge Durango V8, Iveco Daily, Jaguar F-Type (V6 and V8), Jeep Grand Cherokee 5.7L 8-cyl Engine Code [T] EZH (2014 -), Jeep Grand Cherokee 6.4L 8-cyl Engine Code [J] ESG (2014 -), Jeep Grand Cherokee V8 & diesel, Ram 1500 V6, V8, & diesel, Range Rover Sport (2012), Rolls-Royce Phantom, Maserati Quattroporte (2013–), Dodge Charger V8 (2015-), Dodge Challenger V8 (2015-), Aston Martin Vanquish (2015), Aston Martin Rapide S (2015),[14] Alpina B3 (F30/31), Alpina B4 (F32/33)
8HP75 (2nd Generation) 750 750 Alfa Romeo Giulia Quadrifoglio, Alfa Romeo Stelvio Quadrifoglio, Aston Martin DB11, Aston Martin V8 Vantage (2019), BMW 5 series (G30/G31/F90), BMW X5 M (F85), BMW X6 M (F86), BMW 7 Series (G11/12),[15] BMW X5 (F15)[16] BMW X3 30D (G01), RAM 1500 (2019-)
8HP90 900 1000 Rolls-Royce Ghost,[17] Rolls-Royce Wraith (2013), Bentley Mulsanne, Bentley Continental GT, Dodge Challenger SRT Hellcat, Dodge Charger SRT Hellcat, Bentley Bentayga, Audi RS 6, Audi SQ7
8HP95 (2nd Generation) 900 1000 Jeep Grand Cherokee SRT Trackhawk, Rolls-Royce Ghost Black Badge, Rolls-Royce Wraith Black Badge, Rolls-Royce Dawn Black Badge, Aston Martin DBS Superleggera [18]


Alfa Romeo[edit]


Aston Martin[edit]







  • H8 (2017-)
  • H9 (2017-)




  • Jeep Grand Cherokee (WK2) (2014 MY+)
    • 3.6 (845RE 2014-2016, 850RE 2017-)
    • 3.0, 5.7, 6.4 (8HP70)
    • 6.2 Supercharged (8HP95)
  • Jeep Wrangler/Wrangler Unlimited (JL) (8HP50 Second Generation)



Land Rover[edit]


Ram Trucks[edit]




See also[edit]


  1. ^ "ZF unveils new 8-speed automatic gearbox". PaulTan.org. 3 May 2007. Retrieved 18 September 2009.
  2. ^ "Fuel saving and minimizing CO2 emissions". ZF Friedrichshafen AG. Archived from the original on 19 July 2009. Retrieved 18 September 2009.
  3. ^ Mike, Hanon. "ZF Develops 8-Sped automatic". Article. Gizmag.
  4. ^ "Maximum driving enjoyment with maximum agility". ZF Friedrichshafen AG. Retrieved 18 September 2009.
  5. ^ "8-Speed Automatic Transmission". ZF Friedrichshafen AG. Retrieved 19 September 2016.
  6. ^ a b "The freedom to exceed limits" (PDF). ZF Friedrichshafen AG. Retrieved 18 September 2009.[permanent dead link]
  7. ^ "ZF and Chrysler Reach Agreement for new 8-Speed Automatic Transmissions". Retrieved 10 June 2010.
  8. ^ https://www.salernoduanesummit.com/blog/grab-chryslers-8-speed-automatic-transmission-save-2-5-billion-fuel
  9. ^ https://www.youtube.com/watch?v=dLsdrHqQl7c&t=171s
  10. ^ "ZF showcasing second-generation 8HP 8-speed transmission at NAIAS; additional 3% boost in fuel savings". Green Car Congress. Retrieved 13 July 2015.
  11. ^ "Transmission technology from ZF" (PDF). ZF.com. Retrieved 20 February 2018.
  12. ^ "New Eight Speed Transmission Introduced by Chrysler". Retrieved 2 September 2011.
  13. ^ "New Generation of the 8HP in the BMW 5 Series". Retrieved 20 August 2014.
  14. ^ a b "Aston Martin Automatic Gearboxes". JT Automatics Ltd. Archived from the original on 25 April 2016.
  15. ^ "2016 BMW 7 SERIES SEDAN: TEUTONIC TECHNOLOGY". Retrieved 24 April 2016.
  16. ^ "BMW Model Year Actions – July and August 2014". Retrieved 24 April 2016.
  17. ^ "RR ghost specification". Retrieved 21 February 2010.
  18. ^ https://www.jeep.com/compare/detailed-chart.html?modelYearCode=CUJ201803&variation=1
  19. ^ "New vehicles with ZF technology". Retrieved 18 June 2011.
  20. ^ "New vehicles with ZF technology". Retrieved 18 June 2011.
  21. ^ "Audi Considering 8-Speed Transmissions for Majority of Its Lineup". Retrieved 17 February 2010.
  22. ^ "First Full Hybrid Based on the Audi Q5's ZF 8-Speed Automatic Transmission". Retrieved 14 September 2011.
  23. ^ "America's First Luxury Sedan With Eight-speed Automatic Transmission". Retrieved 5 September 2011.
  24. ^ "2012 Chrysler Fleet Buying Guide" (PDF). Retrieved 21 July 2011.
  25. ^ "SEC filing reveals new V6 and 8-speed transmission for Ram". Retrieved 9 March 2012.
  26. ^ "2014 Dodge Durango Bows With Eight-Speed". Retrieved 28 March 2013.
  28. ^ "2014 Maserati Quattroporte [w/video]". Retrieved 12 December 2012.
  29. ^ "2013 Ram 1500 Unveiled With Eight-Speed". Retrieved 5 April 2012.
  30. ^ "ZF to Supply 8-Speed Automatic Transmission to new 2013 Ram 1500 Pick-up Truck". ZF Friedrichshafen AG. Retrieved 20 April 2012.
  31. ^ "2013 Ram 1500 Crew Cab SLT 4x4 [w/video]". Autoblog.com. Retrieved 25 August 2012.
  32. ^ "Volkswagen Amarok With 8-Speed Automatic Transmission" (PDF). Retrieved 9 November 2015.

External links[edit]