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1994 Chevrolet Silverado transmission

Tiny
MLEROYL
  • MEMBER
  • 1994 CHEVROLET SILVERADO
  • 6.5L
  • V8
  • TURBO
  • 4WD
  • AUTOMATIC
  • 390,000 MILES
I have a 94 Chevy 1/2 ton with the 6.5 turbo Diesel. The other day I went to drive it and when I pulled out, it shifted from first to overdrive. (Skipping 2, 3, and 4th) The last week it has not been shifting into 4th and overdrive lintel I am a few miles down the road, I then tried to shift done manually and then shift up as I gained speed, but then it would not go over 2. It is giving the code dtc 89 Maximum Adaptation and long shift. The transmission is newly rebuilt about ah year and 2 to 3 mouths ago. I have had a lot of wiring problems with the truck in the past so I tend to think that is what it is, but I was not able to find anything that I could see.
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Wednesday, July 23rd, 2014 AT 5:16 PM

3 Replies

Tiny
CADIEMAN
  • MECHANIC
  • 3,544 POSTS
Take back to the tranny shop and have them check it out.
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Wednesday, July 23rd, 2014 AT 6:40 PM
Tiny
MLEROYL
  • MEMBER
  • 1 POST
I would do that, but I was not the one that had it done, l want to know if there is anything I can do to find the problem. I can't fix it if I can't find it. :-)
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Thursday, July 24th, 2014 AT 6:22 AM
Tiny
CADIEMAN
  • MECHANIC
  • 3,544 POSTS
They need to run a pressure test
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Sunday, October 19th, 2014 AT 3:38 PM

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