SOURCE: four wheel drive
The transfer case has a motor mounted on the exterior of the transfer case,and they do go bad.There is also a transfer case controller (computer) that is part of the Body Control Module (BCM) and i have seen where a malfunctioning "door" open or closed sensor would cause the transfer case controller to inhibit,or,not allow 4WD engagement.Long story short is,scan the vehicle computers for trouble codes,including the BCM,and repair any codes present.If codes are repaired and still no 4WD,test the electric motor that is mounted on the transfer case.When all external controls are operational and tested as operational,the last conclusion would be an internal transfer case malfunction,but as a last resort.This is why it is important to verify and/or repair all external controls,inputs,and commands.The particular transfer case in your Ford has an aluminum case half that is prone to wear,and i shim out the excessive end play as part of the rebuild,so overhauling it in your garage does require more than meets the eye.Good luck.
SOURCE: chevy 1993 half ton 4 wheel drive
Is your 4x4 light coming on? Does the shifter move smoothly into position? I have a 95 that I have just about had every proplem imaginable. Need morre info. John.
SOURCE: 4-wheel drive light on and will not shift-2000 silverado
Your problem is in the front axle.The actuator is no longer working it also is a common problem....
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SOURCE: 4 Wheel Drive Problem
Put the key in the run position and turn your 4wd on and off to listen for the electronic acuator to engage and disengage. If your can hear it then it's macanical and a Quick fix. On top of the transfercase on the driver's side, your going to find three vacuume tube connected to a cauume switch that may have gone bad. There common to go bad and there not the bad of a price at the Auto Zone. Check for any cracks on the vacuume line first then get your hands dirty. Good luck and keep an extra switch in your glove box.
SOURCE: 06 F150 4 four wheel drive wont work
I have a 1994 ford f150, my 4 wheel drive keeps trying to engage by itself even without me touching the automatic hub button....at time you can even hear it engaging and disengaging by itself, the low range light even comes on (dimly)...what could be the cause? the transfer case motor looks good and so does the wiring.
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