If leafs are shifting when turning 2 things come to mind. 1 your ubolts may be loosening up. 2 the spring clamps have opened up. To fix spring clamps first get the leaf pack straight then clamp it down with some c clamp vise grips. Next use a oxygen/acetylene torch and heat the clamp red hot where the 90 degree bends are, try not to get the actual leafs hot. Do one bend at a time heating it red hot and use a decent sized flat head screwdriver to open up the clamps, and a hammer to close them. Typically I find it easier to start off by opening all clamps into a "u" shape. Then get the sides so they hug the pack on the sides nice and tight. Once the u shape is nice and tight on the sides of the pack, it's time to close it up. I don't like to close it as tight as the factory. I usually install a 1/4 plate on top, close the clamp up, and slide the plate out.