1988 240 102k miles
I have a banging/thumping noise on the passenger side in the rear of the car when I go over a bump or pot hole. The noise seems to be the exhaust system. I replaced the exhaust with a under axel, replaced all 10 bushings in the rear, transmission and engine mounts, shocks, drive shaft bushing and muffler hangers. If I am traveling at a higher speed and the bump is small then there isn't a thump. I have about 2.75" between my axel and muffler pipe. I also checked my rear wheel bearings, no issue. The only thing left that I think that it may be is the new catalytic converter (Volvo part) has a floating flange and may undulate when the engine moves on the mounts. When I purchased the car it had the new converter. The other theory is the transmission mounts are after market and may be softer than original equipment (long shot). I am running out of ideas any help would be appreciated. Thank you