TW, 4X4 Welder is correct, the 5600 was a Dodge exclusive. The ZF unit was only rated for 520 ft./lb., not enough for the Cummins. It's easy to verify next time you see a Ford or GM, look underneath, the ZF is aluminum and the 5600 is cast iron coming in at just shy of 400#. I wonder what manual transmission Dodge will use when they re-enter the HP race, as the 6.7 is already de-rated with the G56.