New 4 spider Traction Lock used in production vehicles that had "posi" rearends. This unit has a clutch pack and requires friction modifier additive.

4 spider Torque Sensing Differential that uses a disc style clutch with a billet steel side cover that is a good compromise between the lack of traction provided by an open carrier and the handling issues and noise associated with locking differentials.

Detroit Tru-Trac street and off road worm gear differential. Must specify 28 or 31 spline axles.

The Detroit Locker maximizes traction by delivering 100% of the vehicles horsepower and torque to the drive wheels when it is engaged to keep them locked like the function of a spool. When turning corners the Detroit Locker has the ability to unlock and become essentially an open differential to allow wheel speed differentaition. This unit is a simple, maintenance free unit that does not require any special fluid additives.

31 Spline for 2.891" & 3.0625" bore cases Keeps both axles permanently locked for maximum traction. NOT INTENDED FOR STREET USE. 8.50lbs.