Ok, so I have no vacuum to the CAD, but I have vacuum to the cruise and Jake brake.
I also have vacuum at the gray line going to the transfer case, but I dont know where it hooks up to.
There are four lines going into the rubber block, all of them are occupied.
There is one line coming from the elbow on top of the t-case, but I thought that was the air vent. Regardless I hooked it up to the gray line and still no vacuum to the CAD.
I blew out the lines and reconnected.
Do I have the gray line connected right?
What do you think the problem is? ? Am I not seeing something?
Jim

 

Jim,

If it's anything like my 98.5 the metal vacuum lines to and from the CAD are plugged. I replaced one with a brake line and then the CAD itself went south so I replaced it with a manual cable unit.

Love it, also get the benefit of 2WD Low. Real handy.

Taz

 

I had posted this a few months back when my lines were bad.

 

Well I figured out that the gray line goes to the rubber block and the line that comes from the elbow goes to the tee on the green return line. (If that makes sense)

I cleaned out the ball actuator. I found that the rubber block was covered in ATF, which made it very slimy and pliable, to the point that it no longer sealed on the vacuum posts.

I still dont know where all the ATF is coming from, somewhere on top, because the tail is dry. There is no vent, that I found. It coats the bottom of the floor board. but its not being slung by the driveline. Squirting out from between the gasket maybe, flowing out the ball actuator, I dunno. I read about someone else having the same messy ATF and no vacuum problem but he never posted back with the cause.

I took the lines off the rubber block and stuck them directly on the vacuum posts. Now I have 4wd again. Don't know how long that will hold.

Jim

 

that single line coming off the elbow is the vent. there should be a dust cap on the line right next to the floorboard.at least mine does.

that switch that directs the vaccum to the cad is probably leaking. it has a detent ball inside the case.when you put it in 4x4 it opens and sends vaccum to the cad.quad 4x4 has those switches and says most times it is the switch instead of the cad.