The Clayton products I have are very nice. I don't know if I would have gone with that track bar again. The Drop bracket on the frame side contacts the tie rod and the Trackbar contacts the the diff cover at Full bump. That is with 4" springs about 4" up travel. The Clayton track bar with out the drop bracket might have a little better clearance. I think the Currie one would be better for 4" lift it is offset to the front to clear the cover .
http://www.currieenterprises.com/ces...t.aspx?id=3488