2010 Focus trans noise
Automatic, 55k miles, clean, new trans fluid. Trans makes a whine or growling sound at various speeds and immediately stops when I back off the throttle. Only in 4th gear. Starts up again when power is applied. Note-- do NOT need to be accelerating. Constant speed brings it out, too.
Has been going on for 40k + miles. Delayed getting it in to a dealer because of the hassle we had with my son's 2010 Focus SES, where we had to do the dealership's diagnosing for them.