SOURCE: chevy s10 4 wheel drive will not engage
There is a vaccuum operated switch located on the transfer case that sends vaccum to the accuator that pulls a cable that locks the front end in. Check for vac coming in and out of this switch if no vac out replace it. This switch is a very common problem. You can find them at most parts stores in the help section #49315. please rate.
SOURCE: 2000 chevy 1500 truck stuck in 4-wheel drive
the shifter accuator or the wires going to it on the transfercase..gl
SOURCE: 4 Wheel Drive Problem
Put the key in the run position and turn your 4wd on and off to listen for the electronic acuator to engage and disengage. If your can hear it then it's macanical and a Quick fix. On top of the transfercase on the driver's side, your going to find three vacuume tube connected to a cauume switch that may have gone bad. There common to go bad and there not the bad of a price at the Auto Zone. Check for any cracks on the vacuume line first then get your hands dirty. Good luck and keep an extra switch in your glove box.
SOURCE: Our Chevy S-10 ZR2 won't go into 4 wheel drive
under battery is a vacum operated actuator that pulls your 4 wheel drive in to front axle.Make sure it has vacum going to it .Sometimes the actuator will get a hole in the rubber housing and 4 wheel will not engage.You could also check your vacum lines going to a canister on drivers side fender as sometimes the will come un-pluged and your actuator under battery will get novacum to it.If not it could be your actuator motor which is on the transfer case and is electric controlled and expencive300-400 dollars.Also could be a vacum line
SOURCE: 1997 chevy tahoe 4 wheel drive transmission
my trucks transmission shifts hard and slips only sometimes
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