Revolution Gear & Axle Ring & Pinion Set for GM 8.5" & 8.6" 10-Bolt (3.73 Ratio, Face Hobbed)

This is a 3.73 ratio ring and pinion gear set for the GM 8.5-inch and 8.6-inch 10-bolt axle, one of the most widely used GM rear and front ends across decades of trucks and SUVs. It is the gear set itself, cut to restore proper gearing.

Revolution cuts these gears using a face hobbed, or 2-cut, process followed by lapping, matching the OE method. Face hobbed gears have equal tooth height from heel to toe, which lets them run quieter and carry more load than traditional face-milled gears. The set uses a standard-rotation 30-spline pinion sized for the 8.5/8.6 10-bolt.

A 3.73 ratio is a sensible choice for trucks and SUVs running moderately larger tires that still see plenty of highway miles, restoring drivability without going overly low. Because this fits by axle, it suits a wide range of GM applications using the 8.5 or 8.6 10-bolt.

This listing is the gear set only. Pinion and carrier bearings, crush sleeve, shims, pinion seal and cover sealant are not included, and a carrier or locker is separate. Add a Revolution GM 8.5/8.6 master install kit for the bearings and small parts, and have the gears set by an experienced installer for correct pattern and backlash.

Confirm you have the 8.5 or 8.6 10-bolt and not a different GM axle before ordering. With the right install kit and setup, this Revolution face hobbed set is a quiet, durable regear for the popular GM 10-bolt.