Just recently noticed that my 88GTA has a clunk from the rear and when going over speed bumps or very large dips in road. Doesn’t seem to make the noise going over potholes, smaller/uneven dips in road, etc.

Previous owner installed tubular panhard bar and trailing arms. I checked all the bolts for those, and they seem tight. Not sure where else to look. Previous owner also removed rear sway bar for some reason.

usually only makes the noise when straight on hitting a speed bump at 20mph or so.

 

Looks like it has nice shocks and rear disc upgrade. (Needs the ebrake cables)
just have to bang on stuff w rubber deadblow hammer.

Exhaust (over axle area) , fuel tank, heat shields, spare tire ect

 

Check the torque arm bushing. That can make a nice clunk when it's loose, failing, or had the wrong one installed.

 

checked it too…sounds like right Rear to me. Maybe the exhaust is hitting

 

Take a look at the top shock mount.

 

for what? Just shitty bushing or loose?

 

For the floor pan being punched out around it and it just kinda flopping around up there.

Pop the back seats out to get at it.

 

looks fine. That black crap is rubber

 

Yeah, probably not that.

 

I have this same exact problem. I have been thinking it was the exhaust. Curious to what you find out.

 

Ive had it on the 4 post hoist at work multiple times, I thought the exhaust was hitting in a couple places so I moved it. I’m gonna look again to make sure I’m not missing anything. Otherwise I think I’ll just ignore it.

 

I see your sub-frame connectors are bolted in. Check those bolts while you are at it. I have heard that over time the hole drilled thru the frame can "whooler" and cause the connecter to move under pressure or when pressure is taken off.