first off what a great forum.you guys are very helpfull to the average joe.ok so i have a 94 jimmy 4x4 with push button 4wd.i bought it for the winter and it was working fine.then it would only go from 2wd to 4 low.no 4 high.now it wont even go into 4 low.i read other post and eliminated the vacume actuator under the bat tray.no leaks.it had constant vacumeso i replaced the vac switch on top of the transfer case.still no 4wd.i hit the button and i can hear the electric motor on the transfer case buzzing but still nothing.does this motor.have gears or pins that break or strip?thanks for any help

 

You should start by reading the codes (if any) present in the TCCM. Follow the information in the link below to do so:
NV233 transfer case / encoding motor switch