does anyone know where the vaccum line goes that runs behind the motor on a 96 blazer 4x4. thanks

 

I just decided to buy a Posi Lok kit and do away with the vacuum business on my 4x4. I could foresee future issues.

 

It likely is the one that runs down to the transfer case vacuum switch. THIS POST has the diagrams showing the routing and other information that will likely prove useful.