[vin63]

...as gringoloco mentioned, it's best to make the adjustments to the track bar at ride height because it will push the rearend out/in depending on where in the suspension travel you're at. I had a similar problem you have...then I had to break out the geometry and do some math, which mad me even more upset. After some customizing, I was able to keep my rearend movement to within about 1/2" total side-to-side movement in a 7-inch vertical travel, but I did a semi-custom track bar - I ended up only using the trackbar from my kit, and I had to modify the bar to boot. It is now a J-type bar (I put a bend in the bar) and fabricated a mount and welded it directly to the back of the trailing arm. I had to do a few other things to modify the trackbar's angle of travel, but that's probably more than you want to know. Here are a couple of photos of what I did...