Just an update.
Ive isolated it to the blue wire i think. I believe it is the line pressure solenoid. I know they work with pulsing current, so a brief buzz is normal. Im just not sure if the permanent buzz is supposed to be there or if it is a symptom of a failing solenoid.
I hooked up some other solenoids (outside of the transmission), and the line pressure buzzed. But it then stopped. ..
Im selling the car for cheap. But i dont want to sell a car with a transmission that will die on the new person. Also, i remember the old transmission made a similar sound...
It drives so well currently so im not keen on doing too much fiddling...
Thoughts??