2002 Chevy S-10 np233 transfer case

Hello well first check the switch inside the dash and see if when it kicks out of 4wd that the light is staying lite during this time and if not, check the module on the back of the transfer case. It looks like a round tube with a big plug connector on the back of it, you will hear it kick in and out if it is going bad, but make sure all 4 wheels are off the ground when you do this. I hope this will be of some help to you.