Okay so I live in New England and it has been pretty cold. When it is cold out I hear a squeak coming from underneath me somewhere. It is definitely something rotational because it seems to be consistent with my acceleration. The sound goes away about 5 min into driving. It happened last winter also, but I just ignored it and it went away when it got warmer. I have always suspected that it is the driveshaft centering ball, but I never really dug into it to investigate because it went away. But now its back because its cold again. The problem is that I will sadly be parting with my TJ within a year (I dont want to talk about it, its like losing a child). Anyways, I didn't want to spend anything if I don't have to. I also don't want something to seize up and ruin my T-case or something. So I didn't know if anybody experienced this and has any input.