Adventure Series upper control arms dwarf the factory arms they directly replace. Made from fully-welded, 1/8" steel plate with CNC-machined ball joint and bushing mounts, these arms one-up factory components by providing a significantly increased range of travel and work in conjunction with stock-style rubber mount bushings to provide a quiet ride.. C5201 shock relocation brackets should not be used. For leveling kit installations, the new arms should only be paired with the replacement Zone front shock #s 4615 or 7615. Includes a pair (2) of upper control arms. Not designed for use with Zone's 6" kit. Not for use on a stock height vehicle.. CNC machined ball joint cup with improved positioning ideal for use with leveling/lift kits. High-quality greaseable ball joints with a protective cap to keep out dirt/debris. Zone Offroad 01-10 Chevy 2500/3500 HD Adventure Series Upper Control Arm Kit. OE-style rubber bushings for durability and maintenance-free operation. Improved strength with fully welded plate steel construction. 2001-2010 Chevy/GMC HD Adventure Series UCA Kit. Fully assembled and ready to install. Zone Adventure Series UCA Kit. Suspension Control Arm Kit. Adv Series UCA Kit

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