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Transmission not shifting into overdrive

Tiny
FATLIPS
  • MEMBER
  • 2005 FORD EXPEDITION
  • 5.4L
  • V8
  • 2WD
  • AUTOMATIC
  • 227,000 MILES
Just got the vehicle listed above with a used 5.4 triton 3v. The transmission will not engage in overdrive. Anybody know why? It the fix for the slip into neutral when switching into overdrive since it drives without overdrive.
Saturday, January 30th, 2021 AT 10:03 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,690 POSTS
I have seen the pressure regulating pressure solenoid cause this issue. To be sure lets run the codes and if so I have included the instructions on how to replace the unit in the diagrams below.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

and

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

Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.
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Sunday, January 31st, 2021 AT 11:15 AM

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