Eaton Posi - GM 8.5 10-Bolt 28-Spline

The Eaton Posi - GM 8.5 10-Bolt 28-Spline differential carrier delivers the locking performance that serious truck and muscle car builders demand when upgrading rear axle traction. Designed for General Motors 8.5-inch 10-bolt rear ends, this positive-locking differential eliminates wheel spin during hard acceleration, launch, and cornering by mechanically locking both wheels to the ring gear. Whether you're running a vintage Chevelle, a third-gen Camaro, or a full-size truck platform, the Eaton Posi transforms stock handling and puts power down consistently across both rear wheels.

The 28-spline design interfaces directly with OEM axle shafts and delivers robust engagement through a spring-loaded clutch mechanism that provides automatic lock-up under load while maintaining acceptable on-pavement manners during normal driving. This carrier assembly, manufactured by Detroit Locker—a leader in performance differential technology—uses precision-machined ductile iron construction to handle sustained torque and repeated cycling without degradation. The positive-lock architecture ensures that both wheels rotate at identical speeds when engaged, maximizing traction on unprepared surfaces, drag strips, and off-road terrain where conventional open or limited-slip differentials fall short.

Enthusiasts upgrading 10-bolt GM platforms—including Chevrolet C10 trucks, Camaro models, and Chevelle variants—install the Eaton Posi to maximize acceleration and predictability during competition or weekend driving events. Professional installers and DIY builders appreciate the straightforward spline count (28) and proven compatibility with factory axle housings; no exotic modifications or exotic housings required. Weighing 21.45 lbs, the carrier fits within stock dimensional tolerances, making it a direct-fit upgrade for any 8.5-inch 10-bolt assembly.