Ok, here my verdict on the new 3racing ball diff.
Don't get it. You cannot change/clean the outdrive bearings because the outdrives DO NOT come off. They probably used JB weld to put that thing on. On top of that, it requires you to make the outdrive holes on the chassis bigger. If you make that hole even 1mm too big, the diff will slide out the gearbox. Unless you have a spare lying around, it's not worth it.
It's too bad cause I finally thought we had an alternative to the tamiya one...
oh, and one more thing. It slips no matter how tight you make it.