Haven't read much about those numbers reference the big three for 2014 yet. Have read several articles about the 2013 numbers though:
http://news.pickuptrucks.com/2014/04/who-sold-the-most-pickups-in-2013.html
According to that article:
"In the three-quarter-ton segment, the fact that Ram made some significant changes to its 2500 heavy-duty trucks seems to have given Ram a slight advantage over the Chevy models in 2013. The fact that the Ram 2500 HD now offers coils springs, a new 6.4-liter Hemi V-8 and several other class-exclusive options pushed Ram just ahead of Chevy. As expected, Ford's F-250 ran away with this category once again.
In the one-ton segment, the Ford Super Duty F-350 continued to dominate but it may surprise some that the Ram 3500 HD came in well ahead of the third and fourth finishers. You can bet that has a lot to do with the strength of the Cummins name."
Kind of looked like Ford put them all to shame last year. Maybe that all has changed in the last 11 months?