[RyanN]

Does your Arm really use 4 motor tank drive?

In LabVIEW, right click to get to the functions palette. At the very bottom is the WPI Robotics Library. Then go to Actuators, then Motors. Replace all of the 'Drive' code for the Arm with 'Motor' code.

Also, please be more descriptive. How does the system work? Does PWM 3, 4, 5, and 6 really go to the Arm? What problems are you having? What works? What doesn't work?