Thanks to an upgraded cooling system — optional in 2015 — some  2016 Ram 1500 diesels have increased their ability to tow.

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The rating was quietly changed on the Ram web site and noticed by reader Sean Marzola, then confirmed by  a Ram spokesman, along with the explanation. The 2016 Ram diesel 4x4, Crew Cab, with a five foot, seven inch bed is rated at towing up to 8,400 pounds with 3.92:1 gearing, substantially higher than in the 2015s.

The maximum towing capacity of the Ram 1500 diesel, in its optimal towing configuration, remains at 9,200 pounds.