SOURCE: four wheel drive not engaging
You can check the vacuum lines and diaphram that are located underneath the battery shelf. Comes out really easy. Check that the lines are not broken. There is a vacuum line that runs to a solenoid in the center of the fire wall, make sure they are not broken there, and there is an actuator cable that runs to the transfer case. Sometimes it is as easy as replacing the vacuum hose, the actuator cable, or the diaphram under the battery shelf went bad. If you ever had a battery leak acid because it went bad.....that acid goes under the shelf and eats those lines. Hope this helps.
SOURCE: s10 pickup 4wheel drive wont shift from 4hi to 2hi
Mine is on the front drivers side, is yours? I just about fell over when I discovered who they designed it!
SOURCE: have a np233 transfer case in a 2001 chevy s10
you need to check to see if the front drive shaft is turning when the wheels are on the ground, if the front drive shaft is turning then the problem is in the front differential. i will give you a brief description of how the front differential works when you put the truck into 4 wheel drive there is an electric motor on the transfer case that engages the front drive shaft also when the transfer case shifts into 4 wheel drive it turns on a vacuum switch which sends vacuum to a actuator that is mounted under the battery box the vacuum actuator then pulls on a shift cable that is hooked up to a shift collier inside the front axle assembly the collier then slides and locks the right front axle to the front differential which in turn allows the front wheels to then be turned by the power plant.you probley have a bad vacuum actuator or vacuum switch or on rare occasions we see the shift collier go bad inside the front axle assembly.
now that takes care of the front end but if when the truck is on the ground and in 4 wheel drive and in gear and the front drive shaft is not turning then you need to have the transfer case checked to see if the electric motor is engaging the front drive shaft. it may only be moving the shift frok only part way and not fully engaging the drive.
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