I'm driving a 2000 Silverado 1500 Z71 with push button 4X4 (165k miles). This winter has been particularly harsh and I have had to use my 4X4 a little more than usual. Recently, I pulled out of a parking spot in 4X4 and noticed a low grumble/grinding noise (no clicking or popping) as I turned the wheel all the way to the right . It also felt like the truck was a little jumpy and it had a hard time going forward. So, I tried turning the wheel all the way to the left and had the same result. When I'm in 2wheel, life is good, but turning slowly in 4 wheel sounds and feels horrible. I crawled under to look at the CV's and noticed that the rubber boots were all in great condition with no grease on the outside of the boots. This makes me think that the CV joints are okay. We recently had a ton of rain and I went through some puddles with my right tires. Does anyone think it's my CV joints or could it be something else? Thanks for any input!