I have an unrestored 1950 3100, 216, 3 spd with new wheels and tires and unrestored steering and front end.

I drive regularly at 55 without vibration or wonkiness. I've had the truck up to 65 without issue. I believe that if my engine could tolerate sustained driving at speeds of 65mph I would experience no vibration.

Check your driveshaft, flywheel, whatever else that causes vibration at speed or just drive 55 and be happy with your old truck.

1950 Chevrolet 3100 (Ol' Roy)

1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)