boese1978

Any help id'ing my rear end would be appreciated...the numbers in the pic are 358, it is in a '68 cutlass convertible, 12 bolt, type "O". I found no numbers on the axel tubes. The diff housing has the casting number - 394139. Thanks for the help!!

sparkymark

should be numbers on side of ring gear. got picts?

boese1978

I don't see any numbers anywhere else......

sparkymark

should be on the side near where the gear bolts to the ring

sparkymark

also you can check pass.side axle tubein rear next to housing should be two letter like TO

boese1978

I ended up counting the teeth on the two gears and devided them into each other to come up with a 2.78.....