pretty sure it doesn't work that way, you need a right and left high pressure port to work the dual acting cylinder, here's how it's done on other boxes.
http://www.pirate4x4.com/forum/showthread.php?t=653434


2001Sport 3.0-Headers-Cage-RoofChop-NP231/D300-D44/ARB-Ford9/Yukon/3Link-37's+H1's-PSC Assist-108:1