I hear a slight whine when I first start and drive the truck - sounds like its coming from the transmission or front diff BUT this is the wierd part - it goes away once it warms up and I am still driving but then if I shut it off enough for it to cool down even a little bit, it comes back until it full warms up again! Seems like its only in 1st gear and or 2nd gear too - Wierd if you ask me...