[vin63]

Originally Posted by Bus Ted Knuckle

If you look in your manual, it has a chart that lists towing capacities. The only difference in towing capacities (given the same engine, 4x or not, and body style) is the rear gears. It does not list trans cooler or not, breaking capacity or not, etc., just rear gears.

As Leevon said, the difference is in the gears.

Originally Posted by Bus Ted Knuckle

That is not what I am saying at all.

I'm just trying to make the OP aware that there is a lot more to consider than just gearing to safely pull a 5000+ lbs trailer with a half ton truck since he specifically asked in his original post about "increasing the towing capacity." My two-horse tag trailer with one draft horse weighs in at 5500 lbs and has a tongue weight of 1100 pounds (due to where the axles are located and load location). That would not be safe for a half-ton truck no matter what rear gear.