Strange Engineering offers a wide variety of posi units and differentials to suit popular domestic rear ends. Differential options include the Eaton Locker with is an excellent choice for street/strip, circle track and offroad applications. Clutch style differentials which are ideal for performance street applications and can be rebuilt. Other differentials include cone style Auburn units and the full line of Eaton Tru-trac and clutch style differentials. Strange Spools are used in a wide variety of race cars to replace heavier and weaker cast-iron differential carriers. Spools permanently lock both axle shafts together so that both rear tires will always turn at the same speed. Strange Pro Race spools are forged with Strange designed tooling from premium steel. The forgings are machined on all critical surfaces by computer controlled machining centers and are fully heat treated.