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 ...
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?
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.)
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.
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?