I DO NOT RECOMMEND THIS, but I have heard of it being done... Peterson 4x4 Magazine did this when our System was installed on their truck.
Block the truck... All 4 tires front an rear. Check and then double check that the e-brake is on and the operator knows exactly what he is doing. You will be hurt or killed if you craw under the truck when its running and put into gear. DO NOT CRAWL UNDER THE TRUCK WHEN IT'S RUNNING!!!!!!!!
Use the power steering to move the axle over as much as you need. By turning the wheel with the truck running you can move the axle with you finger. If the trac bar is removed your truck body and frame can be moved side to side separate from the axle, and allowing you to line up the trac bar.
After moving the steering wheel a hair, turn the truck off, check the e-brake and wheel chalks again, and then see if the trac bar lines up with its mount.