My 2013 GT has a notchyness about it when it is cold.... 3, 4, and 5th gears......and a whine around 60-65 mph on the highway in 6th.... does anyones have the same symptoms?
Are you sure the whine is coming from the trans
? Highway whine at those speed is often from the rear axle and is very typical with 3:73's.
Evan, the cold notchiness is experienced by almost everyone. The whine at 60-65 is most likely not from the transmission, but from the rear diff as Steve suggested. I'd take it in, or at least mention it at your first service