RockJock's Johnny Joint® adjustable rear trac bar for TJ Wranglers and LJ Unlimiteds is designed to work with stock rear differential trac bar brackets and aftermarket trac bar relocation brackets. This bar includes all of the same features as RockJock's trail and race proven Johnny Joint® front trac bar and is the perfect complementing unit to the front bar to optimize your TJ/LJ's articulation. This unit is constructed of 1 1/4" heavy wall 4130 chrome moly tubing and features our 2" Johnny Joint® rod ends at both ends. The Johnny Joint ball centers in this bar measure 1.600" wide with a 12mm hole. NOTE: some aftermarket differenial housing brackets require the bar to have a 2" wide mounting with and a 1/2" hole. If this is the case, please call and we can put this ball in the bar for you.