I have a 1994 Z28 just replaced shocks and struts, have triple checked everything is correct and tight but there is loud banging coming from under the floor boards when driving the car over bumps. The car steers and ride perfectly. Where do i start looking to find the source of the noise generally.

sure can i go home to that garage everyday. I replaced them myself. THanks for the tip ill be back under car checking those things as soon as the weather breaks. really appreciate the help.

Check the sway bar while you are under there. Some have bushings that are attached to the body and the hardware at the ends rust away.

I was going to suggest the same thing as tom on the rear trans mount.

I don't know about your car, but some vehicles have a shaft inside the drive shaft for safety in case the outer tube breaks. Just maybe that iner one is jiggling.