Chevy 50,

The easiest rear end swap for you would be to get a 1955 1st series rear end. This is an open drive shaft rear end and can be used with whatever engine trans combo you pick. The 1955 1st is a bolt in replacement. Before that it was closed drive shaft (Torque tube) and after that the spring perches are different.

The only problem with the 1955 1st series is it was only a 6 month poduction run and they are getting harder to find.

If you don't mind welding on spring perches, you can buy an axle swapping kit from places like cpp and put just about anything back there.

The 1955 1st is a 3.90 rear end.

Bill Schickling

Bill Schickling

1940 1/2 ton, 1940 3/4 ton
My web page