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Upshifts normally until it suddenly downshifts

Tiny
JAY STERN
  • MEMBER
  • 1990 DODGE CARAVAN
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 270,000 MILES
(Caravan with just front seats). Vehicle starts, moves in all gears. Upshifts normally until it suddenly downshifts. Turn off engine. Restart and shifts normally for few minutes, then downshifts again. Is this a solenoid problem or are the transmission bands gone and tranny must be rebuilt?
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Sunday, July 18th, 2021 AT 12:16 PM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

This sounds like a valve body issue within the transmission.

https://www.2carpros.com/articles/automatic-transmission-problems

I would start by changing the fluid and filter. Pay close attention to the bottom of the pan and see if there is any metal in the pan. If there is metal in the pan, then most likely you will be talking about a rebuild or replacement.

https://www.2carpros.com/articles/how-to-service-an-automatic-transmission

Roy

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Monday, July 19th, 2021 AT 4:10 AM

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