8.5" 10-Bolt 3.73 Ring and Pinion Gear Set

The Richmond Gear RSG85373 is a standard ring and pinion gear set engineered for GM 8.5" 10-bolt rear ends, offering a reliable replacement for OEM gear sets. These gears are suitable for street, street/track, and oval track applications, and can also be utilized in some drag racing scenarios depending on vehicle weight and power output. If tooth breakage occurs in high-power drag racing, a larger rear end may be necessary. Constructed from durable 8620 forged steel, this matched set is heat-treated to ensure maximum gear life and performance. The ring gear features an 8.5" diameter with 41 teeth and 10 bolt holes, while the pinion has a 30-spline shaft and 11 teeth, resulting in a 3.73 gear ratio. This set is designed for use with 2.73 and numerically higher carriers.