i messed around today and took off the cover for the front driveshaft and the actuator, i have a blue and red vac line that goes to 2 sylonoids on the firewall on the passenger side. the actuator on the axel doesnt move when someone in the cab switches it in to 4h/L. the vac lines seem fine, im going to check if the sylonoids have power and if theres a vac leak.... i found the vent tube from the axel just ended near the sylonoids which was kinda weird, and one of the vac lines was broken at what looked like a check valve or filter but i fixed that and still nothing....hopefully its something stupidly dumb thats wrond and once i figure it out it will work and not cost an arm/leg.