How to route vaccume hoses on 1984 7.4 liter chev.truck 3500

1998 Ford Contour Vacuum Hose Diagram 1998 Free Database Wiring Diagram...

What are you saying is it broken or missing..
Their is a decail that covers the emmissions hose routing .
However there is always a trace of ware the hose was routed and connected look around the answers are their if you look at them fairly .

Pick your choice based on what attachments your engine has hung on it, enter this into your computers browsers search box
"serpentine belt on a 1990 chev k 3500 454"

All go to the inlet manifold .The large fitting to the brake booster smaller fittings to accessories and vacuum advance diaphragm if fitted.

Vacuum lines do not actually go into the transfer case, they go to the 4x4 actuator and there is a vent hose at the top...that is about it.

It goes to the Pvc system. Usually onto a valve cover

We do not have thses diagrams. There is a sticker under the hood that has the routing diagrams.

missing hose? connect sensor to constant intake manifold vacuum. should be a vacuum diagram somewhere under the hood

On line. Google 'emissions vacuum routing', you should be able to get an accurate diagram