Question Stuck in 4x4

[amccoach]

(If this isn't allowed i will delete it, but this question applies to all superdutys). I have a 1999 f250 superduty v10. The transfer case appears to be stuck In 4x4 the solenoid clicks when I move the on dash switch but the drive shaft remains locked. I believe the 4x4 light comes on the dash. The second issue is the truck even with the transfer case locked in 4x4 doesn't have four wheel drive. I believe the needle bearing and axle seal on the passenger side are shot, im not sure if that would cause no 4x4. Any input or suggestions would be great! Thanks!


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[DaveBen]

There is a whole bunch of stuff that causes the 'no shift' problems. The transfer case is shifted by a motor that is actuated by the solenoid. I have never owned a SOTF transfer case. I like MANUAL hubs and transfer cases, and this is why. You had better find a 4 X 4 mechanic to help you. Vacuum leaks are the number 1 reason why the SOTF stops working. The hubs are locked by this vacuum. Lock the hubs manually and see if you have four wheel drive, I would bet you do.

 

[amccoach]

The hubs are only manual on this truck. There is no vacuum lines going to them and I have tried locking them and still no 4x4


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[DaveBen]

Well, my next guess would be the electric transfer case motor.

 

[amccoach]

When I stand outside the truck and have someone switch it into 4x4 I can hear the transfer case click. Would that be the solenoid or the motor clicking?


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[DaveBen]

My guess would be the solenoid. But I am not there...

 

[amccoach]

I'll check it


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[john mathis]

If the transfer case is in LOW lock you need to have your foot on the brake for it to shift out of low. High side is 1 to 1 ratio, shift on the fly...., low side is like 2.6 to 1 ratio and ford built in a safety feature that requires the brake lights to be lit for it to shift out of low.

 

[i-Henry]

Have you tried using the pin point tests to identify the problem? I used them and was able to trace down a similar problem, except my truck was stuck in 4x4.