Larger Rear Tire effect on Pulling Capacity

[jrkendall]

I am thinking of running a 7-14 rear ag tire on the back of my 129 and was wondering what the effects were on available pulling capacity. I know a lot of you run 26x12x12's on the back and they are within a 1/2" radially. The ratio works out to be roughly 85% theoretical tq output to the ground because of the change in tire size.

I know this doesn't affect torque to the rear end (at the axles) but it does affect the pulling capacity (ie torque applied to the ground). Think of this as how doggy your truck feels after putting on bigger tires and not regearing.

Did anyone notice a difference when changing from their 23x8.50's to 26x12's when plowing or hauling a heavy load. Obviously the increased contact patch helped with traction but that will not benefit me since these tires are only 7.5" wide. I just don't want to put these on and find out I'm lacking applied torque when plowing or pulling something heavy.

Thanks!