I have a friend working on his 95 GMC Yukon 4x4 2 door....he has put a Rough Country 3" Suspension lift kit in---this has entailed adding a leaf spring in the rear, new torsion bar keys, ball joints, and A-arms up front. Now, the CV shafts bind on both sides up front...any thoughts as to why/what to do would be appreciated---Rough Country insists it is the appropriate kit for the vehicle and is now suggesting trying their 4" lift kit to remedy the situation. How so??? 
