I've recently (1 week)started having a steering problem with my 00 Camaro SS Build#3981. When I put her in gear, prior to moving, steering wheel is stiff, but as soon as you begin to move, no stiffness at all. Checked P.S. fluid, pump, pulley, rack & pinion, wheels, tires, also had local mechanic check, he says no issues. My next thought is steering column, all looks ok, except for 1 thing I noticed 2 weeks ago, while changing the oil, lower steering column under u-joint, seems to be hitting something,(header?)Today while out, my husband says steering is stiff,something doesn't feel right, we pull over pop the hood, I have him turn the wheel rt., lt, . It makes a chattering sound when fully turned, that can only be heard from the inside of car. Also when he turns the wheel, the L.column seems to very slightly move right then goes right back. So is this bad U-joints, column? Or could it also have something to do with front end suspension as well, ball joint, tie rod ect.? Has anyone else dealt with an issue like this before? Any suggestions/ opinions? Just want to get it fixed A.S.A.P, weather is finally nice, and now can't drive.