Help...
The popping sound from my left rear I'm hearing on my 76 occurs only after the car has traveled about ten miles or so and it feels like the brakes are sticking (but brakes are definitely not sticking). I can only hear it at very slow speeds, forward and backwards. It only lasts for about 10 or 15 feet and goes away. When I first back it out of the garage I don't feel or hear anything. When I jack the car up I dont feel any play, motion, or unstability in my wheel that would indicate bearings to me. I hate to tackle removing the trailing arm if its not a bearing. I read the posts earlier about a shim worn out and it sounds like my symptoms as I can actually feel the pop/bump in the seat. Feels like I'm rolling over gravel with metal wheels. It only does it when I have applied brakes and start back off. If I allow the vehicle to stop on its on on a long hill and take off..I don't feel of hear anything. When I'm driving it only occurs sometimes when I take off from a standstill, not always. I'm puzzled. If I remove the end cap, will I be able to tell if I have bearing issues or not? Is there another way to evaluate whether its a bearing issue or not. What else could it be? Why doesnt it do it all the time? Any help would be much appreciated. Obviously I'm new member of this forum. I love the indepth details.
Thanks,
Freddie

 

It could be related to your emergency brakes. I had a return spring pop off and and it would click every once in a while depending on how it was moving around on the plate. Just a thought.

 

I had a similar problem on my 79. I had a noise under acceleration. Everything seems tight. Turned out to be an drive axle u-joint that worn and seizedmaking it seem like there was no play in the joint. Pull your drive axles to check the u-joints.

 

How many times are you going to ask the same question?

http://forums.corvetteforum.com/c3-g...ubleshoot.html

http://forums.corvetteforum.com/c3-t...difficult.html

 

Mike... Tell him what his head is shaped like.

 

Thanks for the help. I really appreciate it (even if it was posted more than once). Thanks a million Guys.
Freddie

 

It could be several items as per some of the above posts. Another thing to check is your flexible rubber brake lines. Unbeliveble as it seems. If they are old they collapse internally and act like a one way valve.... causing the brakes to drag due to the slow return of fluid back into the master. By the time you pull the wheels off to check the pressure has stabilized. If the lines are old, replace them. Even if that does not resolve your issue it is cheap insurance....since they degrade from the inside out.

 

I had the same sound after mine was safety checked and had apparently ALL fluids changed. Turned out the differential was low in fluid - and once drained and refilled with synthetic and GM additive it's as quiet as a church back there........just a thought..

 

I replaced wheel bearings and u joints....still hear the same popping sound. With the car running on stands I noticed lateral movement in the left rear wheel. It looks like a bent rim..Took wheel off and lateral movement is still there. The whole trailing arm assembly moves in and out as shaft rotates. No popping sounds is heard (only when I'm driving really slow). Could the half shaft be warped to cause this? Could I have a problem in the diff box? The right side is very stable.
Freddie

 

Also replaced Diff fluids
Freddie

 

If you are running it with the rear suspension hanging, the u-joint is binding. You should support the trailing arms to get the half shafts sitting more level then try it again.

 

Sounds like posi clutches to me.

 

What happens when Posi clutches go out. Is it something that leaves you stranded? Major Job?

 

Will not leave you stranded. Just pops after it gets hot. Change fluid and add posi additive. Usually solves the problem, at least for a time.

 

Thanks so much