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, 8620 alloy. Primarily for street, oval track, and lightweight 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.