2020 Chevy Silverado 2500HD/3500HD, GMC Sierra 2500HD/3500HD 4WD - Fits 3.5in Lifts Only. Fabtech's Uniball Upper Control Arms provide increased strength to the front suspension by replacing the stock ball joint upper arms that can become worn and eventually fail under aggressive offroad use. These heavy duty upper arms are designed for longevity in rugged offroad conditions. They also feature additional caster compared to stock upper arms for superior on road use with oversized tires. The top quality construction of these arms include .120in wall 1.50in OD 4130 Chromoly tubing and American made 1in FK Stainless PTFE lined Uniballs. The 17-4 Stainless Steel heat treated Uniball pins fit into the factory ball joint tapers without modification to the spindle for easy return to stock feature. Fabtech uses 17-4 Stainless steel for the misalignments that provide proper clearance of the 1in Uniballs throughout the travel range. On the frame side of the upper arms, there are quality urethane bushings that help reduce road noise while providing longevity. Fabtech's Uniball Upper Control Arms are an excellent upgrade to stock or lifted suspension systems for drivers that demand the best for their vehicle. Features: Arms eliminate factory upper ball joint w/ super strong 1in ID Stainless Steel American Uniball for increased suspension strength. Additional caster is built into Arms for enhanced align ability with oversized tires. 1.50in OD .120in wall 4130 Chromoly tubing reduces flex found in stock arms for more positive road feel. 17-4 Heat treated Uniball pin fits into factory ball joint taper without modification to the spindle for easy return to stock feature. 17-4 Stainless steel misalignments for proper clearance of large Uniballs throughout the travel range. 250 wall DOM bushing barrels with welded gussets for strength.. Fabtechs Uniball Upper Control Arms are designed to replace the factory ball joint arms to strengthen the front suspension for aggressive offroad use. The tubular Upper Control Arms feature 1.25 OD, .120 wall thick chromoly tube construction with 1 diameter Stainless Steel Uniballs that attach to the factory spindle without drilling. These Uniball Upper Control Arms have been designed to work in conjunction with the stock suspension, or as an add-on to Fabtechs 2 and 6 systems.. No Wheels/Tires; 14. CAN NOT USE OEM Wheel AND TIRE.; 20. DOES NOT FIT STANDARD CAB MODELS.; 199. DOES NOT FIT GMC AT4 OR CHEVY TRAIL BOSS MODELS. For Suspensions That Require Additional Strength/Alignability. Fabtech 2020 GM K2500HD 3.5in Uniball Upper Control Arms. Arms Super Strong 1 in. ID Stainless American Uniball. 17-4 Stainless Steel Heat Treated Uniball Pin. Arms Are Direct Replacements For Factory Arms. Uniball Control Arms; Front; Upper;. Arms Eliminate Upper Ball Joint. 3.5" GM HD UNIBALL UCA ONLY.. Fabtech-3.5" GM HD UNIBALL U. 3.5" GM HD UNIBALL UCA ONLY. 3.5" GM HD UNIBALL U. Uniball Control Arms. Suspension Lift Kit. Control Arm Kit

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