bleeding power steering system

[greasemonkey]

Like the title says, what is the best way to eliminate all air from a power steering system? I installed an AGR box, rebuilt pump, and new hoses and followed the instructions (jack truck up, turn wheels lock to lock at least 20 times, crank engine for two minutes) but I think I still have air in the system.. At idle, it works okay, but if revved slightly, I can feel a "shuddering" in the wheel as I turn it that feels like there might be air in the lines. Also, the wheels turns more freely to the right than the left, not sure if that is significant but just thought I would add it.
I have tried revving the engine and turning the wheels lock to lock, and while the truck was jacked up it was fine, but once on the ground it still has that weird shuddering when I turn the wheel. No squealing, just a noise like air bubbles in a line. All lines are sealed well, I chased down all the leaks already. Would this be air in the system or something else?
thanks in advance,
John