Official 2011 Power Numbers
#16
I would be willing to bet that the V10 coupled with the 6-speed transmission would be quite he setup. The fact that Ford will continue to put the V10 in the cab-chassis is an indication that they know that the 6.2L is not up to the task of the heavier vehicles. While the 6.2L is a good compromise, it obviously is no replacement for the V10. If it were, then they would not still be using the V10 in the heavier-duty applications.
And the loss of torque is bad enough, but the fact that it comes so much higher in the rev range just makes it worse.