Col I have found that the Slipper pads do need a scuff every now and then to freshen them up, this seems to cure the problem for me (600 wet and dry does teh trick).
As for the diff rings there is a knack to building Tamiya diffs that are nice and smooth, I know that this doesnt apply as much as it does in TC racing but here it goes anyway.
Required: 600 grit wet and dry, High quality silicon diff lube (best I have found is the Schumacher stuff) and patience!!
Take the diff plates and one of the diff halves (the one without the sticky out bit) insert the plate into the diff half and rub on the wet and dry (wet the wet and dry first) till you have taken the shine off the diff plate, now only using the lube on the inner face put a very thin coating on it, assemble the balls into the diff and then tighten, using a diff setting tool make sure that there is no slip in the diff, now back it off 1/4 of a turn at a time until it just starts to slip.
This is the abriged version, for maintenance make sure that every surface in the diff is spotless and grit/dust free, this is the only real way to have trouble free runs every time with these diffs. (Oh and rebuild after every meeting!!!)
Col if you need diff plates I have some here, Got mine from RC mushroom, but also available from RC-Champ.
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2 x TRF 415 MRE's 2 x TRF 501X's I'm TRF-Tastic me Come to the blue side and feel the love!!
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