Tbh the Traxxas ball diff is pretty tough anyway, and is in some of the Traxxas Nitro buggy range and various other Traxxas electric buggies - so will certainly handle a fair amount of abuse. It certainly takes 6.5 brushless & Lipo no problem with a metal layshaft gear.
Thats for the whole diff assembly mind you, you can still buy most of it seperately if you search for the part numbers on that tech sheet i linked you to....
If you look around you can still find lots of new Traxxas parts for buggies like the TRX1, 3 , SRT etc etc in shops. The newer moulded ones will be black, the older ones white. And theres still a fair amount of interchangeability between old and new Traxxas buggies. Its just takes a hour or two on the internet and a couple more cross-referencing part numbers.
Not quite sure where get the 100-150 bucks from for a ball diff set - its 50 Dollars from Tower and 45 Pounds from Modelsport ?
Good luck with the rebuild though
