SuperPro Complete Lower Control Arm Kit - TRC475 The SuperPro TRC475 Complete Lower Control Arm Kit tackles common 4WD repair issues while delivering durable, high-performance control and alignment. Features and Benefits Part number (SKU): TRC475 Overcomes problems with seized lower inner camber bolts, worn ball joints, and bush replacement. Two complete arm assemblies included. All SuperPro bushings pre-installed. Re-designed and up-rated ball joints. Up-rated camber bolts for four positions. Enhances your 4WD's handling and performance. Designed to solve alignment issues when you lift your 4WD. Approved Nationally - VSB 14 Compliant (ADR compliant). High quality, form factor welding and assembly. High grade steel for increased strength. Built to meet SuperPro QA standards; engineered to outperform OE and competitor products.