Adjustable Control Arms Rear Upper Wrangler TJ LJ Grand Cherokee ZJ JKS ManufacturingUpgrade your Jeep Wrangler TJ, LJ or Grand Cherokee ZJ performance and reliability with JKS J Flex adjustable rear upper control arms. CNC bent from stout DOM tubing, the fully adjustable design allows you to fine tune suspension geometry. The ends are also fully rebuildable and greaseable. With heavy duty 1 1 4 inch 12 threads and hex shaped weld in bungs, tightening of the included jam nuts is super easy and secure. At the non adjustable end,