Newb retrofit question

Nothing separate as far as drives unless I take apart the DNC control box. Everything was wired to that. Attached is a better picture of the back of the box.
The aluminum pieces with the fins on the left were labeled x axis (or maybe cross axis) and y-axis.
 

I think it would be worth removing the top cover to see whats inside.
The heat sinks are made by the motor manufacturer. One of them is labelled power so it will be interesting to see whats on the other side of the heatsinks as I would expect the motor manufacturer has supplied discrete drives. If there was a model number you may be able to find documentation.

Bringing this back as I've finally dug this out of the corner and taken yalls suggestion of taking this apart. 

Looks like the model number for the axis control boards are D41-17445C
and the power supply board is D41-17337B

I've been searching for any wiring diagrams related to these things but haven't really turned up much. One of those free pfd places let me actually preview a CMC maintenance manual which looks like it has a wiring diagram for the control box but was too blurry to read when I zoomed in. 

The driver board does have a place for a tach as well. 

The servos only have 4 wires going to them, I assume plus and minus for power and two tach wires based on that I can read on the control board.
Part of the driver board has wires going directly to the power supply, the rest goto the main control board of which I can't really figure out what they are supposed to be doing. 

Would it simplify things to simply get a driver that can handle those servers? 

Do you have the part number of the drives?
Can you get a picture of the drive connections

(The drives are the modules with the aluminum heat sinks)

That should be the numbers above.I did get some more pictures though.see attached. I can hook the large plugs back up if need be but most goto what I’m assuming is the control board mounted to the front.  

drives 
   

Those look like standard analog drives,

The real trick is figuring out the 14 pin connector pinout

The D41-17443C seems more common and probably has
the same pinout

Have you tried contacting CMC?