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Powertrax® Lock-Right Lockers are brute force devices for rugged truck applications. They provide the best value for greatly increasing the traction of 2-wheel drive and 4x4 trucks and Jeeps. Lock-Right is the first design not requiring complete replacement of the differential case assembly. Installation is simple because the ring and pinion setups are not altered. Installs easily in rear axle, front axle, or both front and rear. Best suited for extreme off-road to severe on-road use. Proven in the most demanding applications worldwide.