Intermitent rear suspension noise

I have a 95' Corvette that I have been having difficulty finding an intermitent thumping noise coming from the rear suspension for some time.

I have replaced tires, shocks, spring bushings, adjusted exhaust and replace exhaust mounting bracket bushings.

Anybody had this experience or got any ideas where to look next?

have you looked at the actual mounting of the rear end maybe?? never had that problem

I had the same problem in my 85 when starting off and sometimes shifting. I replaced a u-joint and that fixed it.