All are powered at the front.
The manual talks about which way the rotation of the flanges and drives are (clockwise or counterclockwise). I can give you the manual number and you can compare the drive of your xmsn with the final drives of the receiving tank and see if things are going to match up.
Manual can be downloaded here:
http://www.liberatedmanuals.com/TM-9-2520-234-35.pdf
The manual also mentions that the outputs are not necessarily left and right of the vehicle. It is considered that the transmission side that faces the engine is considered the front of the transmission, so left and right are off of that point. And the left and right outputs are reversed to right and left if the drive units are attached to the transmission.