Having some issues with the 4wd on my 1999 Silverado 1500. The auto 4wd seems to work great, but 4Lo and 4Hi don't seem to work at all. The switch seems to work fine, as when i hit the buttons, the light flashes for a few seconds then comes on like it's supposed to.
Also, when i hit 4Lo, i can feel it lock in down below. However, nothing seems to happen with the front tires when i go to pull something. Any ideas on what could be wrong? I've read that it could be the ABS/traction control system that's messing it up somehow...