rc18b questions

[eovnu87435ds]

so I picked up a rc18b on the rctech donation thread(and a propulse roller for spare parts), and ben happened to get a mini T. we decided to build these seperatley with a contest this winter, with a limited budget to see who can build the better 18th scale.

that aside, Ive heard the rc18t and b have to deal with blown diffs, even with brushed setups

Can I shim them or something to keep this from happening? or is it time to stock up on spares?

also, what sounds like a good power combo? Im thinking the 1/10th sidewinder and a cm2054(5400kv) on 3s for now, but what do you all think?