Hi all I am a newbie to the forum and I have a 1984 dodge ram W150 4x4. I am curious as to why my automatic locking hub front axle does not have vaccum lines going to it to engage it into 4-wheel drive? Is this a full time 4wd system? if so how does it work. I have seen other vehicles with vacumm lines and when I don't see one under my front axle I am a little curious?