No eganging front axel in 4x4

My front axle is not engaging in 4x4. The transfer case is. I checked the front axle shift mechanism under the battery. The hose to it has suction, enough to hold it on my finger.

Any thoughts?


Is there away to change this operation from vacuum operated?

www.posi-lok.com

I just got one for my blazer, and it's nice stuff around 135.us

I haven't had a chance to install it yet so I don't know how it will work, or how tough it is to install.

sorry that's the wrong address
here's the right one
http://www.4x4posi-lok.com/