I have a GM rear that came with a parts truck and I don't have a clue as to what it is. It is under Chevy 1939 1/2 ton pickup. It has a front drop out with a solid back housing. It has 10 bolts that hold in the drop out also. It has the following numbers cast on the pumpkin. E207 3725889 or 3725899 GM

I am sure somebody knows and would greatly appreciate any info. It has 5 bolt wheel on it also if that helps.

Thanks again Ed