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Thread: Diff Swap

  1. #1
    Join Date
    May 2018
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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
    Join Date
    Dec 2008
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    NH
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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
    Join Date
    Jan 2018
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    Pueblo West, Colorado
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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
    Join Date
    Mar 2017
    Location
    Bedford, Texas
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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
    Join Date
    Dec 2019
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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.



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