Okay, so my Jeep has been at my buddy's shop for almost three months now. I took it in to get the gears changed in the model 20 and the Dana 30 that I had from the factory('85 CJ-7). When he went to change the gears in the rear, he noticed that it was spinning the bearing races in the housing. So essentially it was bad. Well, I talked myself into swapping in a Dana 44 in the rear. He pulled the front to check it out because there was a lot of water in it, and while he had it out he talked me into taking the Dana 44 that he had sitting there, cut to CJ width. So now I am getting Dana 44's front and rear. Sound's good right? No. So that was at the beginning of December. Now here it is February 12 and he calls and says it is finally ready. So I go to pick it up. I drive it home and notice a loud growling noise from the rear. Well, I called him and he told me to bring it back. We took it for a drive and while we were driving the growling(almost a bass note, more of a grumbling I guess. Heck you guys know how hard it is to describe noises!) got worse and turned into a vibration. Well that got worse and so I had to leave it with him again. No telling when it will get done. So he thinks that the drive shaft is a little short (an inch or less) and that could be causing the vibration. When I got underneath it I noticed that the driveshaft was offset to the passenger side about an inch. He says that they do all of their 44's like that so that the axles will be the same length. I didn't think that an inch offset would hurt it but I don't really know. We checked the tires, drums and re-set the driveshaft thinking it might be out of phase. None of that worked. He said tomorrow he will pull hte rear driveshaft and drive it with the front to see if that eliminates the problem. Anyone have any ideas what the vibration might be?
Thanks for staying with me. Sorry for the long post. I haven't had my Jeep in a while and it is starting to get to me. The only stinkin' thing I don't know anything about is differentials. Next time I think I might take a crash course.
'85 CJ7 258 w/Weber Carb and Nutter Bypass. Dana 44's F&R, 3.73 gears with Trac-Loc rear. Always looking for peoples $0.02.