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No I think that is something for the ABS perhaps. My connector was mounted just under the dash above my right knee when sitting in the driver seat. It’s a rectangular connector, called an ALDL connector.

Is it this one??

Yes, that is the ALDL connector. FYI you can access both the DDEC and the Allison form this connector. I know this because Andy from the Wanderlodge forum reprogrammed my Allison through my ALDL connector. 

You will need the adapter cable for the Bluefire that I mentioned in my earlier post. 

http://obd2allinone.com/products/ALDLto6Madap.asp