The transfer case is electronic, comes in after a limited amount of rear wheel spin. Mine will spin all 4 tires until the traction control crashes the party. Lots of guys pull the relay for the traction control and/or transfer case but that sets a code and kills the ABS, etc. Pulling the transfer case relay makes it a 2wd. Rest assured, guys have been snipping wires and pulling fuses on these to get "big brother" out since the first one was sold
Me, I'm just thinking of running a throttle cable from the pedal to the throttle body and bypassing all of that computer crap
Colin