it's mostly like a buzzing sound. it does it when going from p to r to d and anywhere between. also i hear it when slowing and the tranny is downshifting. it night always do it from gear to gear, but there ard the only shoes when the wind noise isn't louder than the tranny noise. it's not real loud, obviously. but you CAN hear it from 20-30 ft. away if listening for it.