4l60e Problems
No gasket right? I pulled a core apart recently and found a gasket there, the only one I've ever seen. Should not have a gasket.
Rubber seals good, look at the wiring. Hook your scanner up with the switch unbolted and press each port to see if the scanner picks it up.
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If you can, the next time it does this don't cycle the key just unplug the harness from the transmission, it should drive in third only. If it doesn't move you have an internal problem.
Maybe you could just unplug the harness first and drive for 5 minutes. If it still goes to neutral maybe do a pressure test. If the pressure doesn't change you need to disassemble the whole thing and start over. Disassemble it, air test everything, find the problem.
Also note you have 2 sources and reading for the manual positions the pressure sensor when the car is running and the prnd321 switch, Now if the car quits moving because you have lost pressure due to a restricted filter the you would have just the P/N reading from the pressure sensor during this time but it should be normal when the car is moving.
I think I would change the filter first and see what happens









