I bought a Slash 4x4 for my son with Mamba Max Pro 1406 with a 2s 5000, beyond that it pretty much stock.
My question is about gears and heat, we run in the sand at the beach with sand paddles and a gear ratio of 19 pinion to 54 spur. I noticed the motor casing and wires get extremely hot and the other day the truck would randomly stop working and then 30 sec later take off. Is this an overheating issue and could it be related to my higher pinion gear?

PS. Does any else run in the sand eat gears, is there anything I can do to help?