Spent some time out in the shop yesterday. I had put this FORD Racing 8.8 373's in my Terminator I guess about 3 years ago and had a small amount of whine on deceleration. Was indicated that its because of the Delrin Bushings from the Full Tilt Boogie kit transferring the harmonics of the driveline. Time to see. Going to just put the OE 355's back in and listen to the quite is what I'm thinking.