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.

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2 answers
Try changing the transmission fluid
Or it could be low
Try thoses if not maybe a sensor
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.