In 1951, Passenger & 1/2 ton torque tube,
outside diameter was increased
from 2 13/16" to 3 1/4",
and the tube wall thickness reduced
approximately .028 of an inch.

Bushing sizes,
http://chevy.oldcarmanualproject.com/parts/1929_54/346.htm


-Tom

1950 Chevy 3100 w/ 1956 235