2005 Ford F-600 spicer 7 speed slave bleeding

I've got an 05 Ford F-650 with a Cummins 5.9L and a Spicer 7-speed manual transmission. The hydraulic line right behind the dash came disconnected. I re-attached it and put the pin back in. I figured I'd bleed the line so I looked for a bleeder valve at the slave cylinder and found none. I disconnected the line at the slave (I fear this was a mistake). The line drained but the resivoir level did not change. I now believe that the slave cylander and the line need to be bled as well as the master. There are no bleed valves on the cylinder. I figure I should take the slave off the frame (so that it's vertical) and fill it. THen fill the line, but this will just get me back to where I was. The dump bed is full of about 12,000 pounds of concrete, so towing it somewhere will be expensive. Any help would be appreciated!

THanks! 303-668-2222