Question about 2004 Ford F150
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.
Vacuum is used to hold the IWE ( Integrated Wheel End ) gears out when the engine is running and in 2H. When the engine is turned off, the vacuum will bleed off and the IWEs will lock into place.
Here is a block diagram of the IWE vacuum system ( for New Body Style 2004, not a 2004 Heritage )
Posted on Jul 10, 2010
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Posted on Jan 02, 2017
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Removal & Installation NOTE The following procedure may be used to remove shoes on either side of the vehicle.
Fig. View of the actuator (1), support (2), adjuster spring (3), return spring (4), caliper adapter (5), shoes (6), hold-down clips and pins (7) and adjuster (8)
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Fig. Rear hub and bearing mounting bolts
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