fordlemon

Have a 97 F150 4X4. Problem is this. When swithing from 4hi to 2hi it seems the actuator or vacuum solinoid on the front diff will not shift back to the 2hi position. Im assuming thats why im getting fluid puking out the vent tube cause its not dissengaging all the way.I checked the vac lines to the actuator on the diff and they both have vac at the same time. When im in 2hi should i only have vac on that line and vise versa. Perhaps maybe its a bad actuator.Any thoughts