Richmond Gear. Fits all 4 series carriers (original ratio of 3.73 and numerically higher). 8.875” ring gear diameter, 1.625” diameter pinion, 30 spline, 9310 alloy. These gears are used for ultra high horsepower drag racing applications.

* Note * With the use of a special cross pin, P/N 80-0269, this gear can be used in a 3 series carrier.