[suicideneil]

I believe they sell 62, 65 & 68 tooth spurs for the 3905, and 12-22 tooth pinions. Changing one tooth on the pinion is roughly the same as changing 3-4 teeth on the spur, so it pays to have a selection of both really. 62/22 should give you about 35mph-ish, but I dunno if the spur and pinion will mesh- apparently the motor mount that is to the side of the tranny (rather than above it) offers you more adjustment space before the motor hits the tranny....