Could be one LCA is longer than another, making it track to one side. Its hard to measure 16in on those arms because they have they bend in them. If you jeep is on level ground put your angle finder on the bottom of the ball joint and you should be around 5deg. Both side should be as close as possible. Also make sure your track bar is adjusted right.
2001 WJ 4.7L-selec-trac/4.5" Teraflex springs\IRO Long arms\Iro adj rear LCA/Bilstien 5100 series shocks/ IRO steering Equalizer/|265/75/16 Goodyear Dura-Tracs on Stock rims\Rear Tube Bumper with carrier|sliders|mopar skids.