Quote:
Originally Posted by BrianG
Well, the aluminum cups do flex less so they should save the spider gears. Shimming the ring/pinion perfectly can help those. Other than that, the best thing to use is probably Mike's 8th scale Revo diffs. Or, just use lots and lots of punch control. 
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Just checking. Did you mean to say (DONT FLEX). I know aluminum is a soft metal, but flex in a diff cup is hard to believe.