I am sure you have thought of this but if the pivot points on the rack & pinion conflict with the pivot points on your a arm your going to have severe bumpsteer I believe, in a nutshell you generally cant just throw a longer rack & pinion on a narrower suspension. If you have already checked this and just need to shorten the rack I am also against welding, rethreading is safer, some states also will not allow welding on suspension on their DMV inspections, not the case here in MO though. Good Luck