Click and Clack
Tamiya dual motor gearbox. In order to eliminate the endemic Tamiya gearbox squeal/chatter we ran a bead of clear grease on the round axle nearest the motors. Make sure to do both sides of the axle during initial assembly, otherwise you're sure to have to disassemble it again. This is apparently a common problem based on lots of others in the Sparkfun forums, but this is a sure-fire way fix to it.
