Hi Guys ,hopefully some one can help .I searched threads but could not find any thing that fit my problem . 4wd will engage in reverse only ,the light on the dash lights up ,and vacuum actuator is moving when you push the 4wd switch . As soon as you put in a forward gear the light goes out on dash and the actuator does not work. I cant see it being a vacuum problem because the actuator does work in reverse. Any suggestions would be appreciated .