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Most of the time its the actuator on the front axel. GM has had a problem with these units. If you put the 4-wd shifter in low range is the transfer case shifting into low? You will notice this because it will feel very torquie but the vehicle speed will be drasticly reduced. If it goes into low range then replace the actuator on the front axel.
The IWE is operated by a common vacuum system. When you say does not work, not sure what you are getting at ( only 1 wheel locks into place, or neither ).
Could be you had the vent and vacuum lines reversed, and this did not keep the IWE gear pulled out and it rounded off on the one you did not replace.
Is the issue the front axle does not lock in, or does the drive shaft not lock in at the transfer case ?
Lift and support the front of the truck so the front wheels are off the ground ( take safety precautions, chock wheels, jack stands, etc ) Key on, engage 4x4 and try to turn the front drive shaft. If it turns it is a problem with the transfer case. If it doesn't it is a front axle engagement problem.
When you get to this point, post back a comment to this problem with the info.
The actuator solenoid along with the axel solenoid
switch are located at the rear of the front axel on the
right side.And the transfer case switch is located on
top of the transfer case left side. Hope this helps.
If you can have the codes scanned in your vehicle it would be very helpful to you. If you have a code for the encoder motor sensor or the encoder motor itself on the side of the transfer case, this is where i would begin, quite common with the push button 4 wheel drive. Thanks for using fixya!! good luck
There are two parts to the auto-locking hubs. Inner and outer. Both of them have small tabs on each of the 'cams'. Chances are, they are broken off on the outer hub. When you clean them up real good, you can see them. I believe when the axles turn the outer hub, the inner and outer cams push against spring pressure and lock the unit to the wheel hub. These hubs will break when engaged at higher speeds, especially on a dry tar road.
Check the solenoid at the front axel. This is a rather common prob. First check that power is at the axel, got power, clean and put it back. Please do not even look at the tranfer case! At worst you may need to replace the axel solenoid! Frankster016
The 4x4 actuator located on the front axel/tranny transfer case is probably faulty. Make sure the electrical connector that goes to it isn't damaged. Should be a easy fix.
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