I had an 08 1500 4x4 and had similar problems. Mine ended up being a bad TIPM. I took it to the dealer and they put a shift motor in it, that lasted a day. I took it back and they warrantied the part and it failed again. They warrantied that part and put a TIPM on it and it was good to go and by then the weather had returned to normal lol. Mine had the auto 4wd function which seemed kind of rare for a mid optioned truck, I really liked that feature though it worked awesome.