Pickup Power?
For the Ram pickup, the 6.7 carries ratings of 350 horsepower at 3000 rpm and torque of 650 pound-feet at 1500 if you choose the automatic; torque drops to 610 at 1400 with the six-speed manual. Different emissions certifications and duty cycles are the primary reasons, plus cooling requirements, gearbox input capacity, and the 16-vane VGT on the pickup version. It's approved for B5 fuel and claimed to be 50-percent quieter (remember, sound scales aren't linear), yielding a 3dBA reduction to interior noise levels, and the muffler is beyond any emissions component, so you can take it off if it's too quiet.
Pickups get a Chrysler six-speed automatic, dubbed 68RFE, with a quoted best-in-class gear ratio spread of 5.16:1. Like the Aisin box it has two overdrives, with the Aisin using a much deeper first and the Chrysler box a much shorter reverse ratio. The ISB 6.7 and 68RFE appear in Ram pickups built after January 1, 2007, and pricing hadn't been announced as of press time.--GRW