Originally Posted by AJThor
"When I have had that type problem, it's usually worn Heims on the track bar, which is what that diagonal link is called, or the track bar is in a bind, which may be causing the bolts to come loose.
Another thing to check is if the rear end is square in the chassis, if it is not square, it will push to the side on launch."
The track bar is not in bind, it looks great. The bolts were comming loose so we just added some lock washers. The rear is square in the chassis (as far as our measuring goes). The bottom two links are all the way short. The tops are both different but ever so slightly. .691in passenger side, .673in drivers side.
Having the bars the same length does not mean the rear end is straight in the chassis. I have set up pro built cars that had the four link mounts as much as 1" different from side to side. I always set them up with a string and a square to get the rear end perfectly square in the chassis.
There should be lock nuts on all the suspension bolts.
I am not a big fan of track bars on street driven cars, I build all mine with a Watts link on the rear end. In my experience the rod ends on a track bar wear out in about 100 miles of street driving, enough that there is enough play to affect handling.