"Anybody had any trouble with their OD button on the gear shift working intermittently? The problem seems to be a possible dirty switch but I don't want to guess. Ideas? Works both ways, shifting into OD off or on, can't get the thing to go even after several attempts.

I think grounding issues cause a lot of OD grief. I am not sure where the grounds are on these things though.

If you drop the lower knee bolster cover and/or lower column cover, does your button have the small 2-wire connector for the OD button?

If so, you can get a small momentary switch from radio shack for a dollar or two, unplug the connector, poke the momentary switch wires into the truck-side connector, and test it with the small button.

If it works fine with that temp switch, then the button in the stalk is flaky, most-likely. It pops out of the stalk.