This 1955-1956-1957-1958-1959-1960-1961-1962-1963-1964 Chevy Rear End Differential Case and Bearing Caps is an original used part. You can purchase the case or bearing caps separately but you run the risk of not matching the threads. With this setup you never have to worry about wasting your money with that headache. The case fits any ratio.
NOTE: You may also put in a request for a particular production date but we may not have it.
1955 - GM# ???
1956 - GM# 3707306
1957-1964 - GM# 3725899 (non/Pos)
1957-1961 - GM# 3743833 (Pos)
1962-1964 - GM# 3789812 (Pos)