Rear Differential Gearing Change?
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2004-2007 Cadillac CTS-V Performance Mods Discussion, Rear Differential Gearing Change? in Cadillac CTS-V Series Forum - 2004 - 2007; So how hard is it to change the rear gear in the diff? Would it create havoc with the stability ...
  1. #1
    jweymar's Avatar
    jweymar is offline Cadillac Owners Enthusiast
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    Rear Differential Gearing Change?

    So how hard is it to change the rear gear in the diff? Would it create havoc with the stability track/abs? Sounds like an easier way than changing the gears in the trans. I need taller gear very badly

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    BirdmanTamu's Avatar
    BirdmanTamu is offline Cadillac Owners Fanatic
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    Re: Rear Differential Gearing Change?

    Not tryin to be a smart a$$ but you have to remove the differential, open it up, and change the gears. Then reassemble diff, and reassemble it into the car. It'll take some time even if you've done it before. Changing the rear gear won't cause any extraordinary havoc with the TC or ABS...those are controlled by wheelspin.

    You might be able to do it by disconnecting the driveshaft and driverside axle to gain access to the correct side of the diff to remove it's plate but the clearances would be really tight.

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    jweymar's Avatar
    jweymar is offline Cadillac Owners Enthusiast
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    Re: Rear Differential Gearing Change?

    LOl, ya thats what I think, but I was told to just do the trans gears...

    Thanks

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    AAIIIC's Avatar
    AAIIIC is offline Moderator
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    Re: Rear Differential Gearing Change?

    Changing out the rear diff gears isn't the easiest thing in the world, but I can't believe someone told you it would be better to change out the gears in the transmission. What exactly are you trying to accomplish, and what gears in the transmission are you going to swap to?
    '05 Stealth Grey CTS-V, Hyper Silver Linea Corse Venetos w/Continental ExtremeContact DWs (summer), black Team Dynamics ProRace 1.2 wheels with 275/35-18 R-compounds (track), Hyperblack Rota Torques (winter), KW Variant3s, V2 front brakes, Hotchkis rear sway bar, EPS cam, TEA-ported 243 heads, FAST92 intake w/LS2 TB, JBA Camaro/G8 1-3/4" shorty headers w/JBA cat pipes, Corsa exhaust, UUC motor and tranny mounts, UUC shifter, MAPerformance trailing arms, Specter cradle bushings, etc...

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    jweymar's Avatar
    jweymar is offline Cadillac Owners Enthusiast
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    Re: Rear Differential Gearing Change?

    Quote Originally Posted by AAIIIC View Post
    Changing out the rear diff gears isn't the easiest thing in the world, but I can't believe someone told you it would be better to change out the gears in the transmission. What exactly are you trying to accomplish, and what gears in the transmission are you going to swap to?
    First gear is useless, second almost so. I am trying to make use of the power I am making, being able to use second would be nice under WOT.

    The trans would be a corvette type with the following changes:

    M12 Tremec T56 2.97 2.07 1.43 1 0.84 0.57
    MM6 Tremec T56 2.66 1.78 1.3 1 0.74 0.5

  7. #6
    PISNUOFF Guest

    Re: Rear Differential Gearing Change?

    I believe I read a thread on here where RPM swapped someone's out for 3.42's. I'd like to do the same thing. I've had my diff apart and it's a ton easier than rebuilding the trans. I'm not sure if the gearset is a standard one for our cars or if it's a one off.

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