Hey Bad,
I'm assuming you're knocking teeth off the thing like it's gone to the dentist.
Put a new one on and check that under full left/right lock the tie rod cant contact the spur. This can wear it slightly, weakening it, then it strips because you're only running on part of a spur. Other than this all I can say is aim for a tiny bit of backlash and really crank them bolts up that hold the motor in.
Secondly if something on the car sounds rough as a badger's a*se when braking (and you've sorted the spur stripping out) then look at your front diff/idler shimming. I shimmed it incorrectly when i first built mine and the sound is that of the teeth jumping over one another.
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