Need Hellcat rear diff informaton

Discussion in 'SRT Hellcat Performance' started by Top Cat, Jun 22, 2015.

  1. Top Cat

    Top Cat Gold Member Hellcat Car Club Fastest Cat/Record Holder HCC Charter Member

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    Anyone have information on these units, I would like to up grade the gears if possible?
    TC
     
  2. B5 Blue

    B5 Blue Platinum Member

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    Welded ring gear. Are you asking who males gears or specs to install new ones?
     
  3. Top Cat

    Top Cat Gold Member Hellcat Car Club Fastest Cat/Record Holder HCC Charter Member

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    Looking to see if anyone makes 3.55 -3.73
    TC
     
  4. DrBuick

    DrBuick Gold Member

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    Boosted cars don't need gear. Check any boosted car all 3.25 I just went 8.99 at 170 plus with a 3.25
     
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  5. StellasHC

    StellasHC Platinum Member

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    M6 cars are 3.70 ratios...or so I thought
     
  6. Jim M

    Jim M SRT Hellcat Supporter Gold Supporting Member

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    Charger HC's have a 2.62 rear gear. Like Doc says above, don't need anything taller. I thought I read on here somewhere that the HC dif is a sealed unit and the only thing replaceable was the seals.
     
  7. Top Cat

    Top Cat Gold Member Hellcat Car Club Fastest Cat/Record Holder HCC Charter Member

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    Jim, I would agree with setups getting more boost, but the 11-12lbs needs some help, even if 3.25 :D remember were moving 4000 lbs off the line
    TC
     
  8. DrBuick

    DrBuick Gold Member

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    Yes I'm 15 pound I went 920 @ 156 in my 4000 pound Buick
     
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  9. Jim M

    Jim M SRT Hellcat Supporter Gold Supporting Member

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    I don't think you could get enough tire under a HC if you had 3.55 gears. And I don't think any of us are going to tub out our cars.
     
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  10. DrBuick

    DrBuick Gold Member

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    Find a manual rear end and try it
     
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  11. B5 Blue

    B5 Blue Platinum Member

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    ^^^^^might be easier
     
  12. Blackdevil77

    Blackdevil77 Silver Member

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    If you have an auto, I can't imagine you needing more gears. You're already ripping through the gears and are in 5th gear by the end of the 1/4 mile. The way the gearing is set up on these 8 speeds, it seems you already have the benefits of a shorter and taller gear for acceleration AND top speed. Those 8 speeds helps with that.
     
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  13. VanishingPoint

    VanishingPoint Silver Member

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    The auto makes 1,2,3 shifts before 56 mph! My God man, lower gears!

    Check the Motortrend video starting at 10:31 when they start the auto in second.

    Third kicks in at 55-56 MPH!! That is absurd for a car with 650+ torques [/Clarkson]



    Notice the infamous hood bulge at 11:03 too (You don't need to be going over 160mph to have that happen either).
     
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  14. KLR CAT

    KLR CAT Active Hellcat Member

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    Why would you need lower gear in an 8 speed? Total final drive in 1st is already super steep. Once you have a pulley on there helping the torque hit, good luck getting out of the hole without roasting. I would say at most a slightly bumped stall, CF driveshaft, and fattest stickiest tires you can fit will get you a 1.4 60' if you are making the power.
     
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  15. Paladin06

    Paladin06 Have Guns Will Travel Staff Member Hellcat Car Club Gold Supporting Member

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    The Boys over at SRT are shaking their heads while smiling and saying, we told you so.;)
     

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