i have an '06 limited and i've noticed lately that after i step on the gas and let go, there is a definite whine as the engine spools down, gears are not engaged btw.. checked my serpentine belt and tensioners, all seems fine... i had an '05 limited and i never heard this sound before... anybody else here noticed this as well? turned the a/c on and off and the sound is there regardless... anybody here got a clue?