Towing with a 3.73 F250 6.2L, will a 4.30 axle help ??

You might consider that there is something wrong with the truck.

If your expectations are realsitic (not based on diesel performance), and your truck is that much of a dog, it may be worth checking into. Somehow. Because dealers tend to blow you off when you say the truck feels like it's down on power, and there are no codes in the computer.

Too bad you can't put the truck on a dyno and see what kind of power it's really putting out.