2005 1500 Dodge, Brakes?

I have a 2005 Ram 1500, 4x4 with 50K miles. Last week a notices a slight noise that sounded like a brake squeak when moving slow. I looked at the rotors and pads and they look ok. The noise was not heard again for several 100 miles. Today I had problems on icy roads with the truck not tracking straight as it was wondering or drifting. On dry roads I could hear a howling noise at 20 =96 30 mph as a slowed down. It also jumped a little while tuning to the left, no the 4h was not engaged. The noise sounded like drive train to me. Could a sticky read caliper cause these symptoms?