Chevy/GMC truck rear ends.
I read a post a couple of days ago from another member about his rear end on his Chevy. He said his wife must not have heard that the bearings were going out in it & had to rebuild the rear end in it. Now as a retired GM service mgr. I have to say thats a common problem with them if you didn't follow the maintiance for the rear end. In your owners manual it told you to at the FIRST oil change if you have G80 which is posi rear end you HAVE to drain clean out & refill the rear end lube. The reason for that was to clean out all the left over junk left in the diff's when they were originally put together. Also he mentioned that there were different lubes in the front & rear end diff's. That was true. But in a bulliten that was dated clear back to 1987 that if for any reason you had any late engaugement of the front diff or any noise when going into 4WD to replace the std. 80/90 gear lube with the 90/140 synt. gear lube. Most every GM front diff after about 5000 miles ended up with the synt. gear lube in both front & rear diff's. But also if you couldn't show that you had changed the rear diff lube at the first oil change usually at 3000-4000 miles GM would not warr. the rear diff's on any of the trucks. That ment all the trucks form the blazer to the Koadack trucks with 4WD. We would usually fix them because of cust. sat. but we would make you feel very guilty before you got out of there. So you would come back & do all th manitiance fromthat time on. But again it is not unusual for the rear difs to get trashed in the GM trucks. The Chryslers & jeeps were even worse. We would replace about 3 Jeep rear diff's a week while I was there durung 99-2005.
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11-25-2014, 04:14 AM
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