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The pinion angle was set at 2 degrees by adjusting the upper control arm length when the driveshaft was installed, but Buck placed an angle gauge on the rearend cover just to confirm that it hadn't changed. Since Project Fox's rear suspension uses stiff Heim joints, it doesn't need much pinion angle. Cars with rubber control arm bushings need -6 to -7 degrees, while urethane bushings reduce the required angle to -3 to -4 degrees. Reducing pinion angle decreases vibrations and parasitic power loss.