Any tips on getting the gears to be a little quieter? Mine sound like they're grinding a stone out, but they're all clean and lightly lubed with super-speed gear lube, and have smooth bearings on them.

I bought a new set with a new steel pinion to no avail, but I haven't replaced the diff gear yet.. could that be it? It's the TA03 ball diff... do they have replacements for just that gear?

Does the M04 Aluminum heatsink-mount actually do anything? It's only touching the motor with 2 screws...

On a side note, what colour should the Tamiya black-can Sport Tuned brushes be? I think I've overgeared it for a race and baked them with the TB-02 , and they're a dark purpley-grey. I forget what they were before, but i'm being outrun in every race (hey, could be the batts too, I guess). Is there any way to fix them, or is that it? How hot should it be after 5 mins?

Thanks!