Tresrey rear hexes, AE slipper pads, carbide diff balls (i personally wouldn't bother with gear diff, i have both and went back to ball diff), and pay great care when building the diff, use the proper build guides. also look for you tube vids of breaking in the rear diff once built.
you are correct that the gear diff is in theory a fit and forget item, however its not a quick diff to remove like in the 410 so if you want to change the oil in it whilst at a track it's gonna take a while....
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Yokomo. Nemo Racing
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