i just wanted to show what can happen with 12cell power if you forget 1 tiny little shim because you are in a hurry to go run
here is the ring and pinion out of the "bullet Proof" xxl transmission
good shot of whats left of the pinion
and some teeth that were left throughout the transmission case
it only took about 2 min of diving to do all of that, shims turn into a big deal at this power level