So I stop by my diesel mechanic on my way into back into Tucson, just to see if he has an idea of if it is something I might be able to fix myself, or if I have to get the monster towed. Guy #1 agrees that is sounds like some sort of solenoid, and yes, the tranny pan needs to come off to fix it. Crap. Guy #2 is listening, hears my description again (wont go when it drops into any gear, has a bit of a grind getting back into park), asks/confirms that my rig is a 4x4, and tells me to go home and take the transfer case out of neutral. Doh! I must have kicked the stick while installing the radar detector, sitting on the center console. Sure enough, I get home, take the transfer case out of neutral, no problem. At least I didn't get it towed to find that out.