I got rid of my proline transmissions but responding to your earlier post, if you're trying to fit a sealed diff on a slash platform (or any traxxas 2wd), the latest Fastlane Machine Super Diff is just about perfect (at least, for my needs).

It is extremely strong, but it uses large bearings around the outdrives, and it uses regular traxxas 4wd diff parts for the inside (i.e. the bevel and spider).

Note that it only uses 2 spider gears (vs 4 in the proline diff) but the build quality is excellent. The diff case is very heavy relative to normal diff cases.

I tried the proline diff for quite some time and either the case or the diff would always fail.