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Thread: Diff Swap

  1. #1
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    Diff Swap

    I have a 2019 Charger Scat. I’m swapping the stock 3.09 diff for the 3.90 diff. Anything I should know? Break in period? Will the speedo still read the right MPH? Tune is not need right? Thanks.


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  2. #2
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    Speed is taken from the front wheels, so no worries on speedometer being off. Tune isn't necessary. Can't imagine any break in necessary either. Drive it and have fun.
    2006 Charger Brilliant Black R/T w/R&T Package, 6.1 Arrington based 426 Hemi @ 13:1 compression 2016 Hellcat Charger rear cradle and brakes swap, DSS 4" custom driveshaft, 3.09 Scat Pack rear diff.

  3. #3
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    Maybe it's different on the newer cars, but on the earlier LX's you need to change the gear ratio in the computer with a Diablosport or similar, or you will go into limp mode.

    Sent from my SM-N950U using Scat Pack Forums mobile app

  4. #4
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    Quote Originally Posted by JD323 View Post
    Maybe it's different on the newer cars, but on the earlier LX's you need to change the gear ratio in the computer with a Diablosport or similar, or you will go into limp mode.

    Sent from my SM-N950U using Scat Pack Forums mobile app
    '15+ don't need to do anything but swap and drive Diff Swap

    Sent from my moto z4 using Tapatalk

  5. #5
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    Quote Originally Posted by punisher69 View Post
    '15+ don't need to do anything but swap and drive Diff Swap

    Sent from my moto z4 using Tapatalk
    This exactly.

  6. #6
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    Quote Originally Posted by JD323 View Post
    Maybe it's different on the newer cars, but on the earlier LX's you need to change the gear ratio in the computer with a Diablosport or similar, or you will go into limp mode.

    Sent from my SM-N950U using Scat Pack Forums mobile app
    On the newer cars the front wheels provide the data the car needs regarding speed. It could care less what the gear ratio is.
    2005 Chrysler 300C 5.7 SBE, ported big valved heads, 784ac lifters, SRT 6.1 intake manifold, SRT shorties, custom grind Billy Drakeford cam, SLP LM1, MTCM and GETRAG 3.06 swap.

  7. #7
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    Are there any other ratios available.
    Black Betty 06 R/T Hemi now gone and I miss her very much
    Now I have Darla 2013 classic r/t plum crazy.
    Darla is also gone, now have 2019 scat pack charger

  8. #8
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    Quote Originally Posted by reddishdsb View Post
    Are there any other ratios available.
    3.70 & 3.90's from the manual Challengers.
    2006 Charger Brilliant Black R/T w/R&T Package, 6.1 Arrington based 426 Hemi @ 13:1 compression 2016 Hellcat Charger rear cradle and brakes swap, DSS 4" custom driveshaft, 3.09 Scat Pack rear diff.

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