Took a trip to VA with our 1995 Honda Civic (247000 miles!)...1200 mile round trip...last 200 miles back it suddenly started to shake like we hit rumble strips out of no where...as soon as we let off gas it would stop but would start back again as soon as we would hit 60-65 mph.
Now we have changed all four tires...and rims We have replaced rear wheel bearings...and brake drums....replaced front CV axel...now both axels are new.
The shake is not as strong now but there is still a small vibration. Stills feels like the vibration is coming from back not front. No steering wheel vibration at all. No brake pulsing. No visible damage to all rubber bushings.

Any ideas? We have already put in alot of money and don't seem to have found the answer yet

 

How are the trailing arm bushings, also check the rest of them.

just becuase, how are the lower ball joints looking?

 

have you tried some fuel injection cleaner sometimes the rumble might be a clogged injector...worth a shot and its like 3 bucks at any auto parts store..

 

Maybe the wheel balance is still off.

 

Yes, your fuel injectors make your wheels wobble...

 

Probably alignment

 

That's what I was going to say after ur scepticism and wheel bearings did u do an alignment also are you sure the wheels awesomw completly balance I waould also replace trailing ARM and lca bushings since its a 16 yr old car