Transmission not shifting out of first gear

Tiny
KIM BEASLEY-BARNETT
  • MEMBER
  • 1989 CHEVROLET TRUCK
  • 4WD
  • AUTOMATIC
  • 155,000 MILES
Transmission will not shift out of first gear.
Thursday, February 1st, 2018 AT 12:45 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,274 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
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Tuesday, February 13th, 2018 AT 10:49 AM

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