There is also a possibility that you may have broken leaf springs in the rear, some are undetectable till ya take em apart leaf by leaf, this will also cause a vibration at about 45 to 50 mph............resto44

keep on trukin'-
\'50-something Chevy 1/2t
\'31 Chev 1.5t
\'53 project 3/4t
\'57 1/2t
\'64 3/4t