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Check the oil in the transfer case. If it has lots of metal in it... time for a new one. They aren't the world's strongest.
Another check: Lift the front of the truck, while keeping the rear wheels on the ground. Engage the 4x4 switch (then turn the truck off) crawl under and try to turn the front driveshaft by hand. If it turns and the wheels turn, the transfer case is the problem if it turns but the front wheels don't... front diff issues. Any grinding, crunching etc is also a clue.
Raise the truck with all 4 wheels off the ground, use jack stands for safety, Start the truck, engage 4hi/4lo operations , put in drive, take foot off the brake and see if the front drive shaft is turning the front diff.
Sorry no idea here without as look to see whats wrong ,could very well be a electric solonoid switch that locks up a dog clutch but 4x4 is not something i do very often .Most i see are permanant 4x4 isnt this truck permanant rear wheel drive anyway and you lock in the front diff by means of a solonoid or a cable
There are actually two actuators, one is located in the transfer case and one on the front differential. the one on the transfer case provides power to both front and rear driveshafts, the front actuator must engage so that the front differential locks and provide traction to the front wheels. This means that even if the transfer case is engaged in 4x4 mode the front wheels will not have traction if the front diff actuator is not working.
there are 2 sensors 1 on transfer case and one on front axle if the light is lighting up than its most likley the front axle sensor if the light isnt lighting up than its the transfer case sensor. hope this helps
Check the front diff. There is an actuator that pushes a pin to engage the front end. This is how "shift on the fly" works. (assuming that your model has this feature) Iv had this problem before & luckily was a simple fix. Some trucks have an electric actuator, others work with air
depending on the year of vehicle and application [push button or floor lever] there are a variety of switches used to actuate the front diff motor.There is one on the transfer case that is engaged when the floor lever is moved into place this sends power to the front diff motor.
Everything on that transfer case is electronically monitored,actuated and controlled.There is a General Motors TSB (Technical Service Bulletin) about a particular switch on the transfer case that over time,accidentally engages the front differential at highway speeds and shreds the front diff.You might want to call your local GM dealer with the vehicle VIN number and have them confirm or deny any TSB's that might apply to your vehicle.Besides that,verify with all 4 wheels off the ground if the front diff is engaging when in 4 wheel low range.Scan the vehicle for diagnostic trouble codes,as the transfer case is controlled by a computer.If the 4WD is malfunctioning,any codes will lead you into the problem area.Many times,the transfer case controller is involved with the Body Control Module (BCM),and pulling codes from the Powertrain Control Module (PCM) will not put you in touch with the transfer case controller.On some Fords,the BCM controls the transfer case and also monitors things like the door open/closed sensors.If there is a malfunctioning door sensor,the BCM will inhibit 4WD operation electronically,so look in all areas.Good luck
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