Transmission slips out of gear

1999 FORD F-150
245,000 MILES • 4.2L • 6 CYL • 2WD • AUTOMATIC
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KEVIN SCHANUEL SR.
  • MEMBER
  • 1 POST
I had the truck on ramps passenger side front and rear the other day to perform routine lubrication. Since then, the transmission is slipping, along with the speedometer reading erratically and the cruise not working.

I checked the wiring harness connector at the transmission and found a little fluid on the two wire connector.

The 'check engine light" is on and flashes sometimes.
Sep 11, 2017 at 4:51 AM
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STRAILER
  • ✓Experienced Mechanic
  • 55,554 POSTS
This sounds like you have a shaft speed sensor that is acting up or the transmission is low on fluid. We should run the codes to see what comes up it may lead us in the right direction so we can get the truck fixed.

Here are a couple of guides so you can get started:

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

and

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

Please let us know what you find.

Cheers, Ken
Mar 24, 2021 at 3:06 AM
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