Baldor Permanent Magnet Servo Motor on Bridgeport Series II CNC specifications?

I just took delivery of my much anticipated Bridgeport Series II T-Ram
3-axis CNC mill - so far so good - the electronics are "blowed", but
the mechanicals including the heads look sound - i.e. no sign that it
should really be used as a boat anchor! Again, so far so good.

I'm hoping for some help getting the specification for the Baldor
Permanent Magnet Servo Motors - the labels are in bad shape, but this
is what I can decipher so far:

Model: 4201988
Manufacturing Code: ends in "39639"
Max Amps: 39
Max Voltage: 120 VDC
Constant or Continuous Voltage: 40.0

The original CNC setup was a "Delta Dynapath 10/CRT CNC" if that helps.

What I'm hoping to find are the specifications for this motor -
especially information on the encoder - I'm hoping to run these with
Gecko Drives, but need to figure out if the existing encoders on the
Baldor servo will put out the right signals.

Any hints or suggestions would be greatly appreciated. More broadly
that idenfication of this motor, I'm wondering if it will work with a
Gecko Servo drive. I'll probably call Maurice at some point, but I
figure that I should at least be able to describe what I've got!

Thanks,

Bob in Florida