You can get the new vacuum solenoids Here-(check fitment guide) http://www.amazon.com/gp/product/B000NTJZ8G/ref=as_li_tl?ie=UTF8&camp=1789&creative=390957&creativeASIN=B000NTJZ8G&linkCode=as2&tag=fordt-20&linkId=CX46XJHTCJC32SXI This transfer case shift motor is the #1 reason your 4x4 is not working Here-(check fitment guide) http://www.amazon.com/gp/product/B000C0Y9E6/ref=as_li_tl?ie=UTF8&camp=1789&creative=390957&creativeASIN=B000C0Y9E6&linkCode=as2&tag=fordt-20&linkId=E3SEIE5OITQIDLLC 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/B00UFL2HP0/ref=as_li_tl?ie=UTF8&camp=1789&creative=390957&creativeASIN=B00UFL2HP0&linkCode=as2&tag=fordt-20&linkId=E4V52ZGE3LQTNPXD 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/b576/makuloco2000/C11544B_zps30a9ad03.gif New R/C Channel R/C Addict Makuloco- http://www.youtube.com/channel/UCyKUMl3gkaLYSxpvQjRgWAQ Facebook- Ford Tech Makuloco- http://www.facebook.com/pages/Ford-Tech-Makuloco/651813524932940 R/C Addict Makuloco- http://www.facebook.com/pages/RC-Addict-Makuloco/1518863088359331?ref=hl