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4L80E Intermittent Shifting Problems

No fluid on the connector. I do remember reading about that. I don't have OBDII, so it will not tell me the DTC you specified. Is ther any other way to diagnose the TCC valve wear? I reckon visual inspection is needed.
- TheJackal
- Post #3
- May 2, 2022
- Forum: Transmissions
4L80E Intermittent Shifting Problems

Hi everyone! I seem to have a problem where my 1995 Gmc Suburban with a 6.5L Diesel randomly will drop into second gear and stay there while traveling at highway speeds (55-70MPH). This even usually seems to be triggered by going up a grade for a prolonged period of time, or if a load is being...
- TheJackal
- Thread
- May 2, 2022
- Replies: 5
- Forum: Transmissions
Greetings to all!

Greetings fellow grease monkeys and gear heads! I have been a big fan of diesels since I first started working on tractor/trailers with my dad back in 2008. After years of owning/driving only gas trucks/cars, I finally decided to get a diesel of my own. I looked high and low at all the options...
- TheJackal
- Thread
- Jan 17, 2022
- Replies: 5
- Forum: Introduction