Hello everyone, my neighbor just bought a very nice 2011 CTS 4WD with a bad front differential for very cheap and I am going to fix it for him. I am wondering what exactly the procedure is for replacing the front diff. I looked at it and I know that I will need to remove the CV axles and front driveshaft, but I am not sure whether I need to remove the sub frame to get the diff out, looks like I might. So if anyone has done this job or knows the procedure or an easier way of doing it I would really appreciate you letting me know, it looks like taking the sub frame down would be a pain on this car and I would rather avoid doing so if possible, but if that's what I need to do that's fine. Thanks in advance, I really appreciate any advice or suggestions!