Gear tooth geometry is determined primarily by pitch, depth, and pressure angle. Pitch: Standard pitches are usually whole numbers when measured as diametral pitch P, the ratio of the number of teeth ...
At left is the stock Chew ring and pinion set from the '65 "ten-holt" shown here. At right is a set of 4.56:1 Schiefer Trans-Torq gears that replaced them. Because the Schiefer pinion has fewer gear ...