i have a 95 4wd and at the vacumnn actuater on the transfer case there is a line that goes to a t connection.two of the lines stay at the transfer case area.the third goes towards the front of the vehicle.is it supposed to connect to a metal line at the firewall or can some one ,point me to avacumn hose diagram of the vacumn switch on the transfer case

 

is your 4wheel engaging?

 

the line going forward doesnt connect to the firewall at all. It should go forward near the battery, your front diff actuator is either on the fender next to, or underneat the battery and tray.