Thanks for the help gang. It was confirmed that vaccuum is required to
disenguage, i switched the lines at the actuator and now SUCCESS!
Disenguaged, and it enguages when I pull the nob! The dash light doesnt
work (YET) but all mechanical systems are go.

-Craig

On Wed, Apr 18, 2012 at 4:56 PM, craig cowan <phishman068@gmail.com> wrote:

> This is a problem...
> Today I was working on fixing the driveline vibration and finally got
> around to hopefully fixing the diff lock. The diff lock has never worked
> since I got this van, but when I had the transmission out tested it with a
> hand vaccuum pump and it locked well.
> I was missing a short piece of hose from the "main hose" that runs along
> the frame rail to the blue check valve going into the "Balls". I installed
> a piece of hose. Without turning the diff lock knob or anything, the
> transmission locked when I started the engine and a few attempts at driving
> (about twenty feet) confirmed that it's definately locked. I don't want to
> drive it again and damage anything, and I want to get it disengaged, even
> if i can't get it "working" to relock.
>
> I took the check valve off just to relieve the vaccuum and sure enough, it
> hissed upon release. This seemed like it should have fixed it, but alas,
> still locked. Does it require vaccuum to "UNLOCK" or just to lock and lack
> of vaccuum unlocks it?
>
> Perhaps my hoses are just swaped at the lock actuator?
>
> -Craig
> '87 Sunroof Syncro
>
>