Select Shift Vacuum Diagram 1981 -1984. The vacuum storage tank is typically located on the passenger side inner fender wall.
From the 1981 AMC TSM Supplement - Courtesy of AMC Eagle Nest Member Way2phastphil
The following pictures are courtesy of AMC Eagle Nest Member Eagle1985
New Process NP 129 Transfer Case (1981 - 1985 & 1987 - 1988)
Dana Disconnect axle (1981 - 1984)
Close Up of Disconnect Housing