Actually I stand corrected....The 14,000 lb. GVW rating is available in the 2017 DRW with the 6.4 gas Hemi/66RFE trans, Cummings/68RFE AND Cummings/Aisin DRWs. The gas HEMI has the most payload of the three with the Cummins/Aisin lower by almost 1,000lbs. due to the heavier engine/trans. I believe that all need the 4:10 gears for max payload.....The RAM specs are somewhat confusing in the brochure.
This article in TCM helps to explain the gearing payload difference. http://www.truckcampermagazine.com/news/tcm-debuts-2014-ram-3500/