SuperPro 19-23 Chevrolet Silverado 1500 / GMC Sierra 1500 Upper Control Arm SetFixed Offset Arms fitted with Uprated Ball Joints and SuperPro Bushes to reduce Arm movement SuperPro's fixed offset UCA set brings front end alignment and suspension geometry back into an ideal spec for Sierras and Silverado lifted 2" to 4" over stock. Measured at a 3" lift from stock the SuperPro TRC6655 kit delivers 0. 5 camber and +4. 0 caster when paired with the OEM lower control arm. Utilizing maintenance free SuperPro bushings and a uprated