1997-2004 Ford F150 4X4 Inoperative In Depth Diagnosis

You can get the new vacuum solenoids Here-(check fitment guide)
http://www.amazon.com/gp/product/B000...
This transfer case shift motor is the #1 reason your 4x4 is not working Here-(check fitment guide)
http://www.amazon.com/gp/product/B000...
To pull codes on the GEM module and verify operation of the transfer case shift motor you can do so cheap by downloading the Forscan software- http://forscan.org/ and purchasing this low cost ELM 327 Adapter to work with it-
http://www.amazon.com/gp/product/B00U...
In this video I go over diagnosing the front axle engagement unit and everything that makes it work.

Solenoid Continuity Check Spec- 50-100 ohms
Wiring Diagram-
http://i1292.photobucket.com/albums/b...

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