First why do you just replace parts with out testing first. Second this sounds like an electrical issue that needs to be traced. If you don't have experience in working with circuits, then you'll need to find someone.
Check the grounding wires behind the front left tire. GM put the wiring directly behind the tire and there is a grounding bolt in the body. This usually gets corroded and nothing in the 4x4 system will work. Clean this up and apply some RTV Gasket sealer to help weather - proof it.
SOURCE: 2001 chevrolet suburban knock sensor
you have 2 of them on that vehicle and both of them are located under the intake manifold.
SOURCE: 2001 Chevy Blazer 4 wheel drive
The four wheel drive systems in these vehicles are simple. The push button controls the four wheel drive computer. The computer tells the encoder motor (on transfer case) to shift. When the transfer case shifts there is a vaccum switch on the transfer that is activated which sends vaccum to the accuator under the battery. The accuator pulls a cable to lock the front axle in. This covers all s series trucks and suv's with push button four wheel drive but not with auto or all wheel. Now to answer some questions. If your push button is lit up but will not go in to four high you should try to reset the four wheel drive computer. To reset pull the courtesy light and atc fuses for sixty seconds install fuses then cycle key on and off 5 times. If your transfer case shifts but your front end does not lock in check for vaccum at the switch on the transfer case in and out. If no vaccum out replace switch motormite number 49315 at parts store. If you have vaccum out check accuator.
SOURCE: 1994 chevy s10 blazer 4x4 push button type
small sylinoid on the top of the transfer case needs replaced. easy to do. it has three vacumelines going to it just trun out and replace like a bolt.
SOURCE: transmission swap
yup, the motor and drive train are the same... if the wheel base is the same between the two trucks, than you can also use the drive shaft from it too
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