The track bar or relocation bracket will bring the front and rear wheels back to being parallel after a lift. If you lift over like 2" I would get the track bar. The relocation bracket is a cheaper fix but doesnt have the adjustability and the axle brackets have been known the break off with that setup.
07 JK 2D X model with 6 speeds. Full Traction 3" ultimate lift kit. 315x75x16 Toyo Open Country M/T on Rock crawler procomp rim. Ruby dana44's front sleeved inside/outside C truss and rear with 5.13's gears. Homemade rock guards, rear bumper w/tire carrier, oilpan/tranny skid, evap canister skid, light bar, switch pod. Riddler diff covers, Cobra 75 w/wilson antenna, Polk speakers, 10" sub, 2x Amps, Lightforce 240 drive light, backup lights, rock lights.