1995 Dodge Ram 1500 overdrive problems
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I had the same problem on my first transmission and did all the things that you have done to correct it with no success. last thing I did was purchase a transmission fluid pressure tester and learned from this forum and the FSM how to connect it to the test ports on the side of the transmission. turns out the overdrive circuit would not build sufficient pressure to operate the 800 pound overdrive spring. probably due to a leaking seal internally. replaced it with a rebuilt unit (transmission) and all good now. I believe mine failed due to the universal type crap fluid put in by one of those quick lane service joints.
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My overdrive always worked , but when i wrecked my transmission when I took her swimming , the guy at the transmission shop told me the overdrive (planetary gears) were moments away from failure . I wish I would have taken some pictures , but i was still a little upset with all the money i was having to spend . Could be that the entire OD unit is just shot .
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Ok here are the results!! The three wires to the solenoid are positive, ground for the torque converter lockup, and ground for the overdrive. There was a short between the pcm and the solenoid for both of the ground wires. Figured that out and got it re wired back up and now I have overdrive again but man that was a PITA