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Message: <blockquote data-quote="stutaeng" data-source="post: 29902" data-attributes="member: 6175">A line pressure guage hooked up driving around will probably tell you if it's a hydraulic issue.The forward drum is known for getting wear from the 2 teflon sealing rings from the input shaft. It's supposed to be a common problem on these units. I think on that issue, the cold (and thicker) fluid holds the sealing rings just fine, but once it gets hot, there's a loss of fluid. I don't think that would cause your symptoms, but could be something similar somewhere else on the transmission where hot ATF leaks somewhere. You would probably see lower line pressure on your guage if that's the case.On the wiring harness: you can unplug the big case connector, and with the help of a pinout diagram, check the resistance of the solenoids. No need to drop the pan for this.[URL unfurl="true"]https://ls1tech.com/forums/conversions-swaps/1827892-4l80e-connector-wiring-question.html[/URL]</blockquote>