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The double adjustable upper arms feature left and right hand threads and Swivel-Max bushings to maximize pinion angle adjustment and eliminate traction-robbing wheel hop for quicker, smoother launches. Increased roll stiffness improves cornering, and driveline vibration caused by improper pinion angle is eliminated. The upper arms are fabricated from CNC-cut steel and billet aluminum. Both arms are fitted with tough fluted polyurethane bushings and greasable zerk fittings.