POSI TRAC LOC,9" FORD,31 SPLINE

Southwest Speed Verified independent store

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Brand New Southwest Speed 31 Spline 9" Ford Rear End Posi-Trac Spool (SWS Part #603-0381). With this unit, under deceleration, the locker allows the left rear to free-spin, while t he right rear stays locked in and keeps pulling Under acceleration, it then locks both wheels back in This 4-pin unit is a clutch-style posi unit that uses several gears to accomplish this; you can see the internal parts below Features a forged steel hat and iron case with extra support in critical areas Does require the use of a friction modifier in the gear lube The ring gear bolts will have to be longer as well Show more