Most of my vacuum lines on my truck are junk. Moslty broken and or not even hooked up. The truck runs good but no 4x4. Can anyone tell me if there is an aftermarket switch to engage the 4x4. or a diagram of where the 4x4 lines run? Ive got them off the t case to the 4x4 acuator but from there into the engine bay they are missing?

 

Two lines run up the firewall, to the back, passenger side of the engine. Green, and white. One is a vent, the other is vacuum supply. Supply hits the bag o' snakes between the engine, and the A/C receiver/dryer. There are a couple lines that run off there, one goes to the vacuum reservoir, one disappears into the cab, for the HVAC controls, etc. Look for the supply line there. The vent line just needs to end somewhere as high as you can get it. (don't wanna suck water in there...... but then, if you are shifting into/out of 4wd while it is submerged....... you are doing things wrong any way. )

 

We can help you fix the factory vacuum setup, or google PosiLok.