Revolution Gear & Axle Ring & Pinion Set for Chrysler 9.25" (1970-18) Rear Axle (3.21 Ratio, Dual Drilled)

This is the Revolution Gear & Axle ring and pinion set for the Chrysler 9.25-inch rear axle, 1970–18, in a 3.21 ratio with standard rotation. The 9.25 is the workhorse rear under many Dodge and Ram trucks, and this is a direct gear replacement for it.

This set features a dual-drilled ring gear, drilled for both 7/16" and 12mm bolt patterns, which broadens carrier compatibility. It is machined from 8620 alloy steel and heat treated to meet or exceed OE standards, with a 29-spline pinion, a 9.25-inch ring gear, and no carrier break for this ratio.

A 3.21 is a numerically low, highway-oriented ratio that suits owners who want the lowest cruising RPM and best fuel economy – or who need to match an existing 3.21 ratio in the other axle – rather than a deep off-road gear.

This is a gear set only. It does not include bearings, a crush sleeve, shims, or a pinion seal, and it does not include a carrier or traction device. Plan on a master install kit and a proper professional setup.

Pair it with a Revolution Gear master install kit for the Chrysler 9.25 to get the bearings and setup hardware for a clean install. Gears carry a 2-year warranty against manufacturing defects.