The Eaton Detroit Locker 225S10 is a locking differential designed for General Motors 14-bolt rear axles with a 10.5-inch ring gear. It fits 3/4-ton and 1-ton GM trucks, vans, cab-and-chassis units, motor homes, and buses from 1972 through 2012. The unit covers all gear ratios, including 4.10 and under as well as 4.56 and above, with a 30-spline, 1.5-inch diameter axle shaft interface. This differential replaces the conventional non-locking internals only; removal of the existing thrust washers is required during installation. Applications span on-road work truck and towing duty, drag racing, street builds, circle track, and off-road use from light trail to extreme rock crawl. Call Pro Gear and Transmission to confirm proper fit for your axle configuration.
Features
GM 14-bolt rear axle application, 1972-2012 model years
10.5 in. ring gear, all ratios (4.10 and under / 4.56 and up)
30-spline, 1.5 in. diameter axle shaft interface
Locking differential type replaces conventional non-locking internals only
Thrust washer removal required at installation
Suited for on-road work/towing, drag racing, street, circle track, and off-road including rock crawl and extreme off-road use
Tech Specs
- Differential Type: Locking
- Axle: GM 14-bolt, Rear
- Ring Gear Size: 10.5 in.
- Axle Shaft Diameter: 1.5 in.
- Spline Count: 30
- Gear Ratio Coverage: 4.10 and under; 4.56 and up
- Model Year Range: 1972-2012
- Vehicle Make: General Motors
- Vehicle Types: 3/4-Ton Truck, 1-Ton Truck, Van, Cab and Chassis, Motor Home, Bus
- Installation Note: Replaces conventional (non-locking) differential internals only; removal of thrust washers required
