Rear Diff???
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2004-2007 Cadillac CTS-V General Discussion Discussion, Rear Diff??? in Cadillac CTS-V Series Forum - 2004 - 2007; Have an 05 cts-v. Have the clunk and have ordered all revshift has for us. Wondering if I should replace ...
  1. #1
    gregj1006 is offline Cadillac Owners Fanatic
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    Rear Diff???

    Have an 05 cts-v. Have the clunk and have ordered all revshift has for us. Wondering if I should replace rear diff while the revshift stuff is going in and if so will this one work for my car? Will the PCM programming be necessary?

    http://www.ebay.com/itm/2008-CADILLA...86b9ff&vxp=mtr

    Appreciate any/all replies

  2. #2
    darkman's Avatar
    darkman is offline Cadillac Owners Master
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    Re: Rear Diff???

    I don't know if it will fit or not. I would check the part number with a GM parts person. Assuming it will fit, I think the only reprograming would be for the speedometer/odometer. I also suspect, but do not know for sure, that any shop with a GM Tech II Scanner can reset the final drive ratio. Finally, it may be inherently nosier assuming the 3.91 ratio is achieved using 43-tooth ring with an 11-tooth pinion gear. (Our 3.73 has 41-tooth ring with an 11-tooth pinion.)

  3. #3
    QwkRhino's Avatar
    QwkRhino is offline Cadillac Owners Member
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    Re: Rear Diff???

    Yes it would fit, but you would have to change the pinion flange to part #19179934 and cut off about a inch off the tip of the pinion in front of the diff. Easy to do. I just went this route keeping the 3.73 Ratio and getting a brand new diff from a SRX that would be as strong as a 3rd gen diff in the V and you would have to do the same mods I mentioned above. This seller took my offer for $480 for a brand new one. Check it out. http://www.ebay.com/itm/251221874036...84.m1439.l2649. PART # 19178781
    Make sure you get the G80 option for limited slip and Gt4 option for 3.73. Good luck.

  4. #4
    ls6junkie is offline Cadillac Owners Member
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    Re: Rear Diff???

    QwkRhino, That is some great information. Do you have a picture or better way to explain the inch of material we have to cut off? Also what is the process for changing the pinon flange, I assume it is all accessible outside of the diff, I.E. we don't have to split the case, correct?

  5. #5
    darkman's Avatar
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    ls6junkie is offline Cadillac Owners Member
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    Re: Rear Diff???

    Interesting posts Darkman. Perhaps it's that I'm such a visual learner but I still am un-clear on what exactly needs to be cut off to get these SRX rear ends to work in the V's.

  7. #7
    darkman's Avatar
    darkman is offline Cadillac Owners Master
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    Re: Rear Diff???

    Quote Originally Posted by ls6junkie View Post
    Interesting posts Darkman. Perhaps it's that I'm such a visual learner but I still am un-clear on what exactly needs to be cut off to get these SRX rear ends to work in the V's.
    I have not looked at one, but I gather that it becomes obvious once you have one in hand together with the drive shaft you are trying to attach to it.

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