1999-2018 GM 1500 & HD 3 Degree Rear Pinion Angle Shim Kit (210-90467)Description Correct your driveline angles on lifted short wheelbase GM trucks with Cognito's 3 Degree Rear Pinion Angle Shim Kit. Essential for eliminating vibrations caused by tall lifts, this kit includes 2 precision shims and center pins that bolt directly to your leaf packs. Features 3 degree pinion angle correction Includes 2 shims and 2 center pins Bolts directly to leaf packs, no welding required Essential for short wheelbase trucks with tall