Ok, here is the whole story. I actually bought this truck USED about 2 weeks ago. It had 3100 miles on it. I have the LE King Cab, leather, captains chairs, big tow package, Rockford Fosgate package, Utility bed package, VDC system, Active brake limited slip, Bed extender and a bunch of other stuff. I got the truck for $25900 out the door!

Not bad huh? The only thing that stinks is that I have to figrure this truck out on my own.
Anyways, I dont have the off road package but my truck does have a "DIFF LOCK" light in the dash. What is this? I have a feeling that when you put the truck in 4 low it auto locks the rear end. I dont know though.
I put the truck in 4 low a little while ago and it turns the VDC system off. But still, the "DIFF LOCK' light never came on. So...I dont know.