ok, so the other day my truck got stuck in 4lo, after a few cycles of the ignition, the truck allowed me to get out of 4 lo, and into 2hi. what it did was all the lights on the pushbutton 4x4 switch went out, and the display center said "service 4wd" it is a 1999 GMC sierra new body style, with pushbutton 4x4 with autotrac II. today while towing on th highway, the "service 4wd" message came on again and the truck dumped itself into 4hi, and all the indicator lights that tell you what drive mode you are in went out. but i knew it was 4hi by the way it is steering and handling. i can't figure out how to get out of 4wd, i assume it's the switch, which in GM's has a history of failing. i ordered a new one but it won't be here for several days. does anyone know how to manually dissenagae the 4wd and put the truck in 2hi, so i can go to school and work tomorrow without risking blowing up a driveline component? by the way, it came out of 4x4 for a few mins today, only when i really needed it. i was pulling my stuck tractor out of a muddy yard that the owner had forgot to mention that the yard had flooded recently. i got the truck stuck and got pulled out by the owner's 4wd toyota highlander, it was very embarassing, so yea, it's been one of those days. thanks a lot guys.