POSI TRAC LOC,9" FORD,31 SPLINE

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 the 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