Detroit Truetrac 14- GM P/U 1500 9.5/9.75 33Spl

The Detroit Truetrac 14- GM P/U 1500 9.5/9.75 33Spl is a precision limited-slip differential designed for full-size GM pickup trucks seeking improved traction and handling without the complexity of locking differentials. Built for drivers who demand consistent power delivery to both rear wheels during acceleration, cornering, and heavy-duty hauling, this differential assembly replaces the factory unit in 1500 series trucks equipped with 9.5- or 9.75-inch rear axles. Whether you're towing, off-roading, or simply tired of tire-spinning acceleration, the Truetrac delivers the torque bias needed for real-world performance gains.

Detroit's Truetrac uses a helical gear design—rather than clutch packs—to continuously meter torque between the wheels based on traction demand. This cam-and-follower mechanism allows the differential to function silently under normal conditions while automatically increasing bias when one wheel loses grip, directing up to 3.5 times more torque to the wheel with better traction. The 33-spline configuration provides robust connection to OEM axle shafts, while the helical design eliminates the maintenance intervals required by traditional locking differentials. Weighing 44.2 pounds and measuring 10.6 x 10.5 x 10.7 inches, this unit bolts into the rear axle housing with standard GM mounting points—no fabrication required.

This differential excels for truck owners who balance daily driving comfort with weekend power. Unlike selectable lockers, there's no clunking on tight turns—the Truetrac engages progressively, making it ideal for both highway cruising and aggressive off-road or towing scenarios. Installation requires removing the factory differential, cleaning the axle housing, and bolting the Truetrac assembly in place using existing fasteners and bearing caps. Compatibility is exact: GM P/U 1500 trucks with 9.5- or 9.75-inch rear axles built from 1999 onward. Verify your axle code and spline count before ordering; this is a bolt-in replacement that immediately transforms rear-wheel bite and acceleration response.