Compression Ignition Addict
Join Date: Aug 2008
Location: Madison, WI
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VSS will be the only thing with a wire coming out of the rear diff, so yeah, it should be easy to spot. I'd say it's low on ths suspect list; it might affect whether the truck moves, but it doesn't affect the starting.
I think your hunch about it acting like it's not in Park or Neutral is a good one. The range selector switch would affect both the starting (neutral safety) and the go-down-the-road issues. I'm not familiar with how they work on the OBS, but a general diagnostic trick is (and it's a little tricky to do with both hands) to put it in Neutral, then hold the key in the START position, and nudge the shifter around toward Reverse and toward Drive. If the starter catches while you're doing that, that suggests that the switch is out of adjustment / out of synch with the shifter.
BTW, that's a relay on the fender, not a solenoid. The solenoid is on the starter itself.
Edit - here's another "dumb guy" test for the trans / neutral switch being out of adjustment. Turn the key to RUN, SET THE PARKING BRAKE, and shift it to Reverse, and hop out and see if the back-up lights are on in the back. Again, nudge the shifter around and see if that gets the back-up lights to go on.
Last edited by madpogue; 06-03-2011 at 08:50 AM.