There is a plunger on your front axel that engages the front end, i had the same problem with mine, to get mine working i sprayed it down with pb blaster and worked it back and forth by hand, i had to do it a few times to get it working.
SOURCE: 05 f150 4x4. 4 wheel drive lights come on but it is not engaged?
change actuator in front hub water gets in there freezez and ruber seal rips part only 120.00 bucks not hard to change beat upper ball joint take of spindle nut think it was 5/8 3 bolts in back should fall out
SOURCE: Ford F150 front tires won't engage in 4 wheel drive
look on fire wall pass. side you will see 2 parts with vacume lines attached 99 percent of the time that is what went i had the same problem
SOURCE: 01 f150 4x4 4whell drive will not engage lights on dash come on
I am going to assume that you have auto 4x4, and not manual shift base model.. it just sounds like the servo motor that shifts between 2x4 and 4x4, has gone bad
question:
does it still engage into low range, even though it is stuck in 2x4?
SOURCE: 2004 Ford F-150 extended cab FX4. 4WD problem
The malfunctioning part in my case is what ford calls the "integrated wheel end" which locs the weel hub on the four wheel drive in or out as need. Part is available from Ford and cost about $110.00. I will do this repair myself.
SOURCE: 2004 Ford F-150 extended cab FX4. 4WD problem
Your front hubs are automatic locking hubs, and the gears are hard nylon. These hubs break very easily, therefore causing you to lose your front wheel drive in 4 high, or 4 low. If you replace the hubs with "WARN (name brand) " manual locking hubs, you will never have the issue again. Of course, you will have to get out of the truck and manually lock the hubs, but they are metal gears, and much more durable. I've personally seen the issue several times, and changing the hubs has resolved the issue every time.
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