Today I was driving on the freeway and my truck started to make a whining noise, very high pitch. The best way to describe it is if you were in reverse at a high RPM, the whine that you would hear. I was in 5th gear at around 3500 RPM, and it would get louder when I put my foot in it. I stopped the truck, turned it off, waited, and drove home a 1/2 hr. never hearing it again. I'm worried because this was a real distinct sound. Truck is an 05 with 23,000 on it. Anyone ever heard a whine like this or does anyone have any idea what the hell this could be.:dontknow: I would appreciate the imput.