Just got a 93 with a thumping sound when shifting gears. Sounds like it's coming from underneath or the rear of the car. Any thoughts on what it can be? The car is in the shop getting basic repairs done so I am unable to test it at the moment but to give the shop an idea of what they might want to look into. If I remember correctly, awhile ago I read about a mount that goes bad and users just reseal it to make it a solid mount which resolves this issue. I believe it was the drive shaft mount.