Transmission not shifting out of first gear

1989 CHEVROLET TRUCK
155,000 MILES • 4WD • AUTOMATIC
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KIM BEASLEY-BARNETT
  • MEMBER
  • 1 POST
Transmission will not shift out of first gear.
Feb 1, 2018 at 12:45 AM
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STRAILER
  • CERTIFIED EXPERT
  • 53,883 POSTS
Hello,

It sounds like you have a shift modulator that is out or the vacuum line going to the modulator fell off. The part the vacuum line must go to is #4 in the diagram below

Check out the diagrams (Below)

Let us know what happens and please upload pictures or videos of the problem.

Cheers, Ken
Feb 13, 2018 at 10:49 AM