I own a 91 Chevy K2500 4x4. I was recently in an accident that did some pretty severe body damage. But, it was still drivable until this last week I notice a lot of automatic transmission fluid leaking out. It looks like a main seal between the engine/transmission. Engine is still good, but has 260K. So I don't want to dump alot of money into it just to have the engine fail. I know I won't get my money's worth by taking it to a salvage yard. My question is this. What other GMC/Chevy Trucks and years use the same 350 engine? Is there someplace that would give me a cross reference? I would like to purchase a later model truck and use the '91 for parts. Thanks.

have a 2000 buick lesabre which vibrates at 72-75mph. No vibration at speeds other than that. You can't feel the vibration in the steering wheel. Rather, you feel it at the floorboard by the pedals. Any ideas on what's happening?