[landmass]

I have an Eaton Detroit Truetrac differential. I got some advice this morning that sounds promising. Basically, using the panhard bar adjustment, I should center the rear axle housing to the frame(not the body) by using measurement points on the frame. Then, using the trailing arm adjustments, make the rear wheels the same distance from the front wheels. This procedure would make the rear end, frame, and the front wheels plumb and square. I'm going to do this in the next couple of hours, then I'll retest the results. I'll mount a GoPro camera under the car looking at the pinion angle under full load to make sure that has still proper after the other adjustments have been made. I've mounted the camera at that location before, and the footage was very dramatic and informative. I didn't believe the amount of movement going on with the rear end under race conditions - everything moves, flexes and bounces around. If I knew how to post a short video clip, I would do it. Thank all you guys for the tips and information. I'll report the results when testing is complete. Vector1 - is this the type of alignment you are referring to?