Strange Engineering offers a wide variety of posi units and differentials to suit popular domestic rear ends. The line of differentials is highlighted by the Strange S-Trac helical gear units for the 9” Ford applications. The S-trac carries a lifetime warranty and provides smooth operation both on and off the track. Other 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.