UMI’s adjustable rear upper control arms are a bulletproof  addition to your street car. UMI’s upper control arms are suitable for street,  strip or corner carving. The greaseable polyurethane bushings minimize  suspension deflection for a crisp handling setup, easy pinion angle tuning and  less wheel hop.  These on car adjustable  upper control arms adjust easily while staying bolted to the car and are  designed to handle many applications. These heavy duty arms feature ¼” thick  CNC laser cut mounting pads and a mix of TIG and MIG welding. These simple bolt  in replacements install in 1-2 hours and are designed to work on all rear end  housings.