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1989 Chevy Truck transmission only shifts at high RPMs. Rea

Tiny
MBUSBM
  • MEMBER
  • 1989 CHEVROLET TRUCK
  • V8
  • 4WD
  • AUTOMATIC
  • 189,000 MILES
Hello. My truck just recently started shifting at higher rpms. It shifts from 1st into 2nd at 30mph and 3rd at 50, overdrive won't kick in until 80mph. Never had any problems until about 3 weeks ago. Gas mileage is breaking me. Any help would be apreciated.
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Sunday, March 16th, 2008 AT 12:03 PM

1 Reply

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Check the "T.V" cable (throttle valve) hooks to the throttle body and is adjustable for different shift points. The cable may be breaking internally. There is a big square that you push in and the end of the cable will move in or out to adjust, try all the way in and go from there, takes some playing around to get it right
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Tuesday, March 18th, 2008 AT 7:48 AM

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