Which transmission will the Jeep Trackhawk use?

Discussion in '2017 Jeep Grand Cherokee Trackhawk' started by El Chorizo, May 27, 2015.

  1. El Chorizo

    El Chorizo SRT Hellcat Admin

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    The weight on the Jeep Trackhawk will be an issue, so I'm wondering what transmission Chrysler will use for this beast? Has to be AWD, has to deal with 700+ HP and 5200+ lbs... there aren't too many choices out there that can handle this. What do you guys think?
     
  2. Hemibuck

    Hemibuck Gold Member

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    It's not even official that they are even going to build it right?
     
  3. ResumeSpeed

    ResumeSpeed Platinum Member Agent 707

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    That is correct, all speculation, wild guesses etc.
     
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  4. MoparProud

    MoparProud Silver Member

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    Well, if it were to happen, one would logically conclude a variant of the 8HP90.
     
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  5. Aaron Vogel

    Aaron Vogel Silver Member

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    If they did it, i would assume the same 8-spd that is already in it, just beefed up to handle the power like the one we have is.
     
  6. Sepipr21

    Sepipr21 Silver Member

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    So what transmission are they going to use? Now it should be official.
     
  7. sliknik

    sliknik Senior Hellcat Member

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    6 speed manual from the Viper :D
     
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  8. NorCaletch19He77Kat

    NorCaletch19He77Kat Silver Member

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    no guarantee that it would be a 707 HP unit--with much lower gearing you wouldn't need it anyway and a 190+ top speed would not be endorsed by the factory either--if it happens, look for a detuned version that will still be truly unbeatable from 0-60.. no reason to believe that an A8 or mild variant wouldn't be the choice...
    I had an
     
  9. SRTFighter

    SRTFighter Silver Member

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    There are versions of the 8HP90 that are AWD, so do count that choice out either.
     
  10. Sepipr21

    Sepipr21 Silver Member

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    200 miles in an SUV...no thanks haha...
     
  11. rayzazoo

    rayzazoo DRIVESRT.COM Gold Supporting Member

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    ZF 8HP90 8-speed automatic. It's the beefed up version of the current 8HP70 in the Jeep Cherokee SRT now.
     
  12. SRTFighter

    SRTFighter Silver Member

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    Fact? or guess?
     
  13. Aaron Vogel

    Aaron Vogel Silver Member

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    Would make sense, its the next strongest one they make and AWD I believe
     
  14. rayzazoo

    rayzazoo DRIVESRT.COM Gold Supporting Member

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    Guess. ZF is FCA's primary transmission supplier. Chrysler doesn't have any other transmissions that would support the torque and also fit in the current Jeep chassis. The original Mercedes 5-speed was used in the Jeep Grand Cherokee before Chrysler invested into ZF. As mentioned in the first reference below, the 8HP has an AWD variant capability.

    8HP70 is rated to 516 lb-ft TQ (700 Nm) and 510 BHP (380 kW)
    8HP90 is rated to 664 lb-ft TQ (900 Nm) and 738 BHP (550 kW)

    Comparatively (Challenger Hellcat 6-speed manual)
    Tremec 6060 is rated to 650 lb-ft TQ (880 Nm) and 721 BHP (538 kW)

    The Hellcat engine was SAE rated at 714 BHP @ 6200 rpm and 652 lb-ft TQ at 4800 rpm.

    Both the 8HP90 and Tremec 6060 can handle much more torque as seen by aftermarket setups but the rated inputs, aside from safety, are also there from a company liability/warranty standpoint.

    References:
    http://www.motor.com/newsletters/20121010/WebFiles/MMM_ZF_8HP_Tranny.pdf
    http://www.tremec.com/anexos/TREMEC_TR-6060.pdf
    Cars | 8-Speed Automatic Transmission - ZF Friedrichshafen AG
     
    Last edited: Jul 6, 2016
  15. ResumeSpeed

    ResumeSpeed Platinum Member Agent 707

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    8HP75 is replacing the 8HP70 (same trq rating)
    8HP90 is rated @ 900Nm for gas engines, and 1000Nm for diesel engines.
    8HP95 (new gen) has the same 900/1000 rating as the 8HP90.
     
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