I have two problems with my 2000 4x2 150 k suburban I need help with. First when I turn circles either left or right in parking lots it makes a continuous popping noise. If I sit still and turn the wheel no noise is made you must be moving. I have ck the tie rod ends and they seem tight. I've jacked the front up and grabbed the tire and tried the caster and camber and there seems to be no play in the ball joints. I cant seem to find the noise.

The second problem is my tow haul mode wont work. It just quit working one day. Is there anything I can check before i take it in.

thanks

 

150K is around time for front hub bearings to be going out. Did you spin tires when checking front end? Sure it is in the front end & not your locker jacking up in diff?