my rear end went out in my blazer about a month ago and i put a new rear end in not the same one though and i know i should of but with this new rear end just recently there started a vibration from about 45-85 and it does it even worse it seems when your slowing down. and when i put into gear theres a clunk but no other noise after that.. could someone please help me?!

 

please do not create multiple posts on the same topic. When someone has an answer, they will post up.

 

My post is right below your I to am experiencing the same clunk when shifting into forwardor reverse and I get a clunking type noise when shift into second especially when it has set over night after ithas warmed up it gets a little better but still noticable. I check and changeallfluids like clock work. I was told it could be the rear u-joint as they oftenfail more than the front but I checked them and they were fine. Hope somebody can help us with this and also myother listed in 4x4 2 hi switch acting weird problem.

 

sorry it didnt show up in the other one so i figured i didnt click the post thing.. my bad.. and my blazer is a 2wd

 

I have the same problem in my 89 a bad "clunk" when putting in gear or changing directions I have changed the U-joints and had the rear cover off the R&P look fine and the "Slack" is somewhere in the carrier/posi unit . Is there a simple fix?

 

I'm getting confused with 3 guys posting their problems in the same thread!

A vibration at speed could be caused by u-joints, driveshaft out of balance, loose pinion gear or wheel balance.

A clunk when going forward to reverse or park to drive could be worn u-joints, backlash in the diff (slack between the ring and pinion gears), slack in the transmission or transfer case.