ORIGINAL: PetRock
Hmm... don't know
why the gearbox bearings failed yet, but a
50% larger motor probably didn't help
Bearings on the front center driveshaft gave up on life, allowing the shaft to deflect and the gear mesh to slip: metal shavings everywhere!
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You can buy complete RedCat gearboxes for $15-$20, so it shouldn't be too costly to fix.
I never have less than two complete sets of diff gears for my sons Caldera on hand. They're not the best in the business.