I have a 1999 F250 SUPER DUTY 4x4... I have too many problems. When I try to conect(electric) the 4x4 doesn't work any position, when I turn the suitch I heard the selenoid but after nothing hapens. The trasfer is always free position. One time I conected the 4x4 manualy and worked awesome. Then I see more cerfully the selenoid I saw that was kind with out strong. Also I cheked the vacum lines and all that was perfect.

Hope someona have some solutions! I will appreciate thanks