An M46 with no OD function is very common. Hopefully, the OD Guru or someone else who knows more than I will respond. I do know that the problem is often the relay, even though it might look good from the outside. Often they need resoldering on the inside, or replacing. You can get them at junkyards for $2-$5, or new for maybe $40 aftermarket.
It could also be the fourth-gear switch on the side of the transmission which only allows engagement of OD when the transmission is in 4th.
Also, the wiring through the shifter very often gets broken due to all the bending and pinching it experiences. You can check this by pulling back the carpet under the passenger's feet, finding the two wires that come down from the shifter, uplugging the connector, and checking for continuity between the two wires when you press the shifter OD button. You should have continuity when you press the button. I rewired mine to a switch next to the cigarette lighter to avoid this problem again. It's not as fun as pressing a button on the shift knob, but I don't have to worry about the wires breaking again.
Good luck.
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Thanks for all the help. DougC. 1981 242 Brick Off Blocks, Turbo bars and wheels, M46. 1990 245, auto, 113k. 1993 245, M47, 154k.
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