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4L80e Transmission dropping out of overdrive
#31
Wowee, that’s a lot of miles you got from that transmission after finding a fix. Interesting way around the problem you found by getting a chip. Clinebarger on the Bob is the Oil Guy forum mentioned it could be a circuit board damage issue in the PCM so the speed sensor or throttle sensor circuit gets screwed up. As Sternwake indicated, that guy has a huge inventory of transmission knowledge. He said to get more data using better diagnostics tools. Someone else on the forum mentioned there is software marketed by Tuner Cat that works well with OBD1 and is affordable compared to special scanners.
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#32
A friend had a Snapon scanner but it didn't pull up anything different than my scanner. Cleaned and tested whatever I could but in the end it was throwing parts at it. The last one is always the right one.

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[-] The following 1 user says Thank You to mudbunny for this post:
  • Roadtripp (07-26-2019)
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#33
mudbunnyA friend had a Snapon scanner but it didn't pull up anything different than my scanner. Cleaned and tested whatever I could but in the end it was throwing parts at it. The last one is always the right one.

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I hear you about guessing at parts to replace. I hope your fix, whatever it was, has lasted. I’ve been on a half dozen short drives and I’m gaining confidence. Maybe I’ll” try a longer drive this evening.  
 I was informed by a transmission mechanic that the computer does no relearning. There is no adaptive technology on this 1995.
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