Allpar reader “AutoTechnician” discovered the 2014 owner’s manual for the 2014 Ram 2500/3500 on the Chrysler web site. He wrote that it mentions:

The 6.4 liter engine has, until now, been the exclusive domain of SRT cars, but Allpar sources have predicted its use in trucks for over a year. The engine will not be a 470-horsepower powerhouse like the one used by SRT, but will be tuned for truck use.

We believe that the big gasoline engine will be used as an entry level option on Ram 4500, which currently comes with a standard Cummins diesel, adding to its baseline cost. With the 6.4 Hemi in the mix, the base price can be dropped for better comparisons against Ford; but most buyers will still probably opt for the durable diesel.

The rear air suspension has also been rumored for two years. Allpar source “Dom” predicted both 6.4 Hemi and rear air suspension, along with a new automatic transmission (this may have been the  Aisin AS69RC released with the 2013 Ram 3500), last June.