Hello all. As from the title, I'm a newbie to this forum. I found it doing a search for a 4wd problem trying to do some troubleshooting. I have an 01 GMC Sierra 1500 with the 4wd lever on the floor. Its only got 110,000 miles on it. The other day my husband ( Yes, I am a dreaded woman :rofl: ) said I'd tore out his 4wd in his truck. I used it in 4wd for about half a mile on pure ice, then switched back to 2wd. I only drove 8 miles in truck that day. He got in next day and said I'd tore it out ..... asked if I'd heard it clunk which I had heater fan on highest setting and the radio up pretty loud so no, I didnt hear any clunking. Would any of you think actuator or encoder motor ? Our mechanic cant take a look at it for a couple more days but was trying to do some trouble shooting. We bought the truck from a very good friend of ours in November and he never had a problem with the 4wd fwiw. Thanks for any direction you could guide me into, to do some research.