The transmission is slipping/noisy in my 2002 Ranger Edge/ what could cause this on 2002 Ford Ranger

Trans. makes a whirring sound most of the time while running, especially from P to R.

check tranny fluid level and condition. review when last serviced it may be due. bring to a tranny shop for diagnostic run. tranny tech. will advise.
1 more answer
Try changing the transmission fluid
Or it could be low
Try thoses if not maybe a sensor