Super-Flex rear upper adjustable control arms for TJ Wranglers and ZJ Cherokees. Allows for rear pinion angle adjustment. All Super-Flex Control Arms feature our rebuildable spherical bearing assembly. A threaded steel insert allows adjustable preload and easy maintenance. The unit is greasable and extremely quiet due to the non-metallic races. This bearing allows extra flex for off-road prowess, yet does not sacrifice on-road handling or long term durability. Sold in Pairs!