If you have a black diff gear you probably have a Sport version of the truck.. and it is a 2.56:1 ratio... black tranny case... Same gear now as the XXX-T CR.
If the tranny case is grey.. XXXT-MF2 then the ratio is a 2.43:1
The 2.19 top gear was from the XX Buggy tranny and did convert over to one of the newer trannies.. just cant remember if it was the same as the GenI or GenII...
If you have the correct gears... there really shouldn't be a gear stripping problem if all the parts are not overly worn. Tranny cases DO wear as well and need replacing periodically.
If you are on an off-road track.. this should never happen.. if you are bashing on the street and landing at full throttle and doing a lot of burnouts and speed turns... ya.. you are going to stress that off-road race truck and break gears...
The diff also needs maintenance to keep it properly lubed.. and if it cant slip because of lack of lubrication or being locked down.. it will stress the gears and break as well.
Good luck!
Jerome
