A good starting point for diffs, 5F-7C-3R, the heavier the diff oil the less diff slip. The more vertical your shocks are set the softer your suspension. The heavier the shock oil the harder it is to compress the shock. 13T CB for a tight, technical, short track. 14T CB for medium length, less constricted track. 15T CB for wide open, big straights, long track. Nova 7075 aluminum clutch shoes w/ adjustment scews set, 1 Inner, 1 Midddle, 1 Outer. I like Kyosho 1.0 springs, and Kyosho metal shielded clutch bearings.