I recently bought this truck about a month ago. Its a 99 chevy 1500 4x4 with the 5.3. It ran amazing for about 3 weeks and then last week it started to do with clunking noise in the driver side front tire and it sounded like it was with every turn of the wheel. It made me think it was the Front driver side CV axle. A Buddy and I jacked it up and the Cv is functioning damn near perfect. I then toyed with the 4wd and the 2wd selector switch on the dash. It does not appear to make that noise in 4wdHI but does make the noise in 2wd. I am thinking its the actuator for 4wf but I am not certain. Can anyone help me out?