When I put my 88 Iroc convertible in reverse (auto trans) I get a slight clunking sound coming from somewhere in the rear. My thought is that it might be my u-joints?? this clunking sound when backing up is not bad or real loud but I do not to be a stuck somewhere if somethings breaks and someone here has had the same issue... Hoping you guys can help me figure it out?

Fivestar

 

with foot on brake and car stationary are you saying that when you engage the gear that it clunks?

If so, it's a u joint

 

I do not get much of a clunk at all when I push on the brake and place it in reverse gear. Actually it is more when I am backing up...it is a series of light clunks while moving backwards. I do not get any clunks at all when I place it in drive and move forward.

 

Mine is doing the same thing. I had to tighten the nut on the front of the rearend and change the u joint

 

I am hoping that is all I need to do. going to be checking and changing those things come Monday (next day off) I will keep you all informed. Thanks for the feedback!

Fivestar