i have a 1986 chevrolet blazer and my 4 wheel drive stoped workin but i have found the problem the actuater hose that runs down to the transfer case has busted but now that i have fixed it i havent hooked it up to an actuater i had to order a new one but i felt the pressure of the vaccume as i stuck it to my finger and i didnt really seem strong enough to pull the differential need/cord so why am i not getting the pressure i need....?

What?--------------punctuation is you're friend

Save yourself a headache and install a Posi-Lok kit.