Fixed 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 high-articulation ball joint the SuperPro UCAs are built to perform and offer superior durability on your favorite trail and superior road manners and on-road handling on the road trip to get there or on your daily commute. Designed and developed in Australia incorporating nearly 5 decades of SuperPro's industry-leading suspension expertise.