1999-2019 GM 1500 / GM HD 4 Degree Rear Pinion Angle Shim Kit (210-90468)Used with short wheel base trucks with tall lift where no tapered blocks were available. Features 3 Degree Rear Pinion Angle Shim Kit for 99 18 Silverado Sierra 1500 2WD 4WD 01 10 Silverado Sierra 2500 3500 2WD 4WD Angle Degree: 3 Degrees Drive: 2WD 4WD Location: Rear Details Includes 2 shims and 2 center pins to bolt shims to leaf packs. Use for single cab trucks or extended cab short bed, with 4 6 Inch rear lift that has no pinion angle change such