I just got a Arduino UNO and CNC Shield 3.0. I am trying to connect the CNC Shield to the TB6600 drivers because I am running 425 oz motors. I have 4 motors total so I am wanting to clone an axis. I can not find any wiring diagram for this type of setup. I am a NOOB at Arduino.
Have you seen this?
425 oz motors? Pretty heavy yes? 
Yes, I know you mean 3Nm hold-in torque steppers, but not everyone here will understand that...
The only point of a CNC Shield is to hold those Pololu-style stepper driver boards.
If you are using TB6600 drivers, you don't use a CNC Shield.
You just find out what pins GRBL uses for step/direction, and wire the inputs of the TB6600 to those pins.
The cnc shield has the option of external drivers and I can not find a way to connect 4 drivers directly to the arduino board.
I understand the pinout on the arduino board but my main question is I have 2 motors connected to one axis (as a slave). This is where I am lost in wiring directly to the arduino. Do I just connect one driver to the arduino and then run the second driver parallel from the driver connected to the arduino? i.e. Arduino to first driver DIR+ then wire to second driver DIR+ from first driver and arduino to first driver STEP + then wire to second driver STEP + from first driver.
I purchased the arduino with the shield because it stated that it could be connected to external drivers and utilize 4 motors on a three axis system since everything I have read so far state that GRBL does not support more then three motors. Bu ti have not been able to finds anything that clearly show this type of wiring diagram.
Arduino to first driver DIR+ then wire to second driver DIR+ from first driver and arduino to first driver STEP + then wire to second driver STEP + from first driver
That would work. You can drive the inputs of two stepper drivers from a single output pin.
Exactly as you described.
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Thank you for the fast response