Thanks for all the help so far! As far as measuring the pitch, which screws should I be measuring? After looking at the picture, it would appear that the cylinder coming out of the stepper motor is smooth, but I'm guessing that's the one that I need to measure? Lastly, what should I be looking for to determine the gearing between the motors and screws as you mentioned?
I think I'll just e-mail the motor manufacturer to figure out the microstepping.