Originally Posted by
Jpdanger
Will ball diff u3856 fit? Is it any different from u4199? From what I can find, it appears to use the same diff halves, gear, and rails.
If you look at all the parts that make of both of these diffs, you will see that they use different part #'s for the gear, the outdrives etc. I cant say for sure if they would interchange but would think there would be enough differences that would hinder interchangeability.