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Nitro's Trac-Lock provides the ultimate in traction for Ford 8"& 9" differentials. This is not like the old factory units that had a tendency to crack the case. Nitro's Trac-Lock uses a billet & forged case for strength you can depend on. Great all around torque-bias ensure this unit will suit your needs for Hot Rods, Muscle cars, Vintage show car and even 4x4s.