I need help decoding these numbers on my 12 bolt housing. The right front reads 3894939 and the left front reads GM8. What do these numbers mean??? I tried to find other numbers but were not sucessful.

Please Help

It's out of a 1967 Chevelle!

Thanks alot dave, thats just what i needed! graemlins/hurray.gif

Oppisite of the part# the 38 number will be the casting date of rear axle and on the middle pass tube usually pointing towards front of car when installed will be code as to original ratio/posi/assembly plant and when axle was assembled.