Yea, I was following the FSM for the pressure, it's just a little hand pump.

So...OK...help me out here. I pull my truck out of the driveway to leave, and I hear something in the rear diff "rubbing" now.

I disengage 4WD and the lights all go off, indicating RWD. But I still heard the noise (sounds like maybe the pin of the diff lock detection switch is making contact with something), so I turned around.

As I turn around, I get "bark...bark...bark..." from the rear end, as if it's now locked up in 2WD. <img src="/forums/images/graemlins/confused.gif" alt="" />

Now I'm really confused. I only got about 4 houses down so hopefully I didn't destroy the detection switch. I guess now I see why the FSM says to remove the friggin' diff in order to remove the detection switch. <img src="/forums/images/graemlins/drunk.gif" alt="" />

Any ideas as to what might have happened? It wasn't locking up in my driveway...I pulled out the switch, put it back in...pressurized it with a hand pump then put it all back together...and all of a sudden, it's locked with no air pressure.

Ugh. <img src="/forums/images/graemlins/angry.gif" alt="" />