Having problems with your 1997 Ford F150 Regular Cab ?

4 wheel drive wont engage on my 97 f150 - 1997 Ford F150 Regular Cab

Posted / edited by AnonymousUser on : 12-08-2019

Answers :

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.

I would suspect that the front drive shaft will not turn, and the issue is with the vacuum shift for the front axle.

The vacuum disconnect motor is on the front axle ( item #10 in the picture below )

Close up of the vacuum disconnect motor ( this is in process of being repaired )

The vacuum solenoids are mounted on the firewall, and take vacuum from the vacuum reservoir to move the shift motor when the GEM ( Generic Electrical Module ) calls for a mode ( 2WD or 4WD ).
The Pink line will have vacuum on it when in 2WD mode, the Light Blue when in 4WD.
Use a vacuum gauge to verify that the vacuum is on the line when selecting the mode.
Repair Help & Product Troubleshooting for 1997 Ford F150 Regular Cab

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