I had my jeep at the driveline shop near home. I explained a clutch chattering noise to him in first gear and he told me it is actually my front DS bottoming out when the front pinion moves during 1st gear pull out. I have 4 inches of suspension lift and a TT. He said one way to fix the rubbing was to grind some of the thick metal around the area where the CV is. Can this lead to other problems if not fixed?? Would a new ( non stock) drive shaft fix the problem??