Overdrive failure

Tiny
JEFFERY T.
  • MEMBER
  • 1993 MERCURY COUGAR
  • 5.0L
  • V8
  • 2WD
  • AUTOMATIC
  • 180,000 MILES
When in overdrive RPM go high around 40 mph. Will not shift. Does not do it in drive only overdrive.
Tuesday, December 4th, 2018 AT 12:14 AM

1 Reply

Tiny
STEVE W.
  • MECHANIC
  • 13,556 POSTS
That car should have an AOD transmission. It uses a mechanical cable to the transmission to control the shift points. However if it shifts fine but loses only overdrive it is likely time for a rebuild as the most common reason for this is a worn or damaged overdrive band inside the transmission. This is indicated by the higher rpm as it shifts into overdrive. The band is slipping.
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Friday, December 7th, 2018 AT 11:11 PM

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