RockJock TJ/LJ/XJ/MJ Johnny Joint Trac Bar Front Bolt-On Adjustable GreasableRockJocks Johnny Joint adjustable front trac bar for the TJ LJ XJ MJ ZJ features an offset Johnny Joint rod end that puts the bar further forward providing more clearance between the diff and the trac bar. Other features include a narrow 2 1 2 in. Johnny Joint at the frame end for maximum articulation capabilities, 1 1 4 in. x . 250 wall 4130 chrome moly construction, a welded in gusset from the bar to the frame Johnny Joint, adjustable Johnny Joint