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Re: stuck in four wheel drive
If you are saying that the transfer case is stuck in 4WD, you may have to get under the vehicle, and look at the transfer case, on the front, you should be able to see where the 4WD shift lever hooks to the linkage. If it is disconnected/broken, take a pair of channel locks, or pliers, and pull the shaft you see coming from the transfer case. this will disengage the 4WD. Unfortunately, if you cant pull it. You will have to get someone to put the vehicle in Drive, and creep forward while you pull it. Make sure their window is down so they ear you say stop.
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If you are driving on the highway in 4wd drive the poise may be from the tyres trying to slip and equalise the drive line torque that is building up . Rule of thumb for all 4 wd vehicles is to restrict 4wd to loose surfaces (gravel-snow-ice -grass- mud --any surface that allows the tyres to slip) to relieve the torque wind up.
there is a "modulator " on the transfer case with a 3-4 pin plug that fails often.this may be defective as well as the relay component that turns it on(rwhich is located under the battery)...try cheching/changing these first....the "modulator" is about 30 bucks and the relay is about the same
When in four wheel drive, try backing up and at the same time shifting it into 2 wheel drive, the fulcrum could be stuck or the shaft it self damaged, it that does not do it. you would have to take of the drive shaft coupling, drop the transmission, take off the top cap and examine it to see if any burrs or chips are present on the sliding shaft which you slide while attempting to shift it?? Be sure to drain the oil our first, also a 1 ton floor jack would be handy to let the unit to the ground after prying it loose from the flywheel (Bolts taken out of course first!)
Had the same problem. Easy fix. Grasp the plastic dashboard piece that goes around the instrument cluster and 4 wheel drive switch and pull off. Remove the 4 wheel drive switch. Unplug wiring harness from back of switch. use small screwdriver and carefully bend all metal tabs in back of switch slightly to one side. Re-install harness and switch back into dash. Should work fine, it just was not getting a connection. Worked great for me.
Your blazer is equipped with a shift on the fly four wheel drive. That means that at speeds less than fifteen miles per hour you can shift into or out of four wheel drive by simply pushing the four wheel high button. If you wish to shift into four wheel low. Stop, put the transmission into park or neutral, and push the four wheel low button. Same procedure for shifting back out. Never shift into or out of four wheel low while moving. And be careful in four wheel low. At full throttle your still barely moving, you don't want to blow your engine up!