Im confused, you say im not going to get any type of performance out of the 34's because they need 100v however they are not rated that high voltage and all but "Z" was working fine.

The upgrades consist of new limit switches/E-stop, rewire from 22 gauge to 16 gauge on the stepper motors, and new connectors between the two modules, what i call the brains (computer and breakout circuit (software)) and the working module (Stepper motors X Y Z and limit switches (hardware)).