28-Spline Std. Series Spool - GM 8.5 10-Bolt

Engineers and builders focused on getting the most grip from their GM 8.5 10-bolt setup will appreciate this Strange Engineering spool. It forces both axle shafts to spin together, wiping out wheel slip and delivering solid, direct power to the ground. Whether you run a street machine, weekend cruiser, or competition car, this spool changes how your vehicle hooks up and moves through turns.

Using a 28-spline pattern that bolts directly to factory GM 8.5 10-bolt axle shafts, no exotic upgrades are needed. Full lock happens when the mechanism binds both sides together, giving instant and steady engagement when you get on the gas. Weighing just 11 pounds, it adds very little rotating weight while standing up to the high torque levels common in modified motors. At 8.6 x 8.4 x 8.7 inches, it drops right into your stock housing for an easy upgrade on 8.5 10-bolt rear ends.

Drivers who prioritize grip over comfort on street-performance and track builds will get the most from this spool. It is also a solid pick for anyone replacing a worn open diff or a locker that does not perform well. You will need to fully tear down the rear end to install it, so experienced builders or pro shops are your best bet. The 28-spline spec fits standard GM 8.5 10-bolt housings found in Chevrolet, GMC, and other GM vehicles across many years. Match it with quality bearings, seals, and axle shafts that can handle your power level to get the longest life and best results.