Its believe that the Titan XD makes use of a down rated version of the Aisin AS69RC six speed found in the HD Cummins Rams
http://www.dieselhub.com/trans/aisin-AS69RC.htmlThe Aisin AS69RC is a medium duty 6 speed automatic transmission offered in the 2013 Ram HD. It is similar in design to the AS68RC, which was only available in chassis cab Rams mated to the 6.7L Cummins. The AS69RC is one of three transmissions offered for 2013, and will be standard on the high output version (385 hp/850 lb-ft) of the 6.7L Cummins. The transmission is larger and more robust than both the AS68RC and 68RFE. Ram claims the transmission has a 64% higher input torque capacity than the 68RFE. It is manufactured by Aison Seiki, a Japanese automotive parts supplier. Though actual input torque capacity is unknown, its application suggests it is in the 850-950 lb-ft range. For comparison, the AS68RC has a max input capacity of 750 lb-ft. The AS69RC also replaces the AS68RC in chassis cab models for 2013. Its wide ratio spread provides low gearing for tow applications, while a relatively high 0.63 second overdrive keeps engine rpm low at highway speeds to maximize fuel economy.