There are many options for ball cups and studs... I believe alot of guys here use Losi cups and Hot Bodies studs. You'll have to do a search to confirm that though. I have been using Kyosho RB5/ZX-5 cups and OEM Tamiya studs.
Slipper and diff tightness will depend on your motor choice and track surface. 501 diffs do need to be tight with my Novak 6.5 Light.
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Tamiya America - Trakpower - 92Zero Designs
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