Unless of course the motors in the RTR cars are gentle enough to not give a problem? 13.5 aren't they? I'm running 6/7/8.5T motors. And it was a run in diff. Not worn out, just run in!
FWIW, the RTR 210 diff i took apart last night seemed fairly smooth before i stripped it down (brand new)
Should have left it with 2 gears and run it back to back (both 210s have similar, low turn motors in)
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