That would be sweet indeed. I have a 93 F250 extended cab SRW 4x4 with the N/A 7.3 and the ZF5, and it does a fine job of hauling wood. I did put 3.55 gears in it to save some fuel. With a full cord on, I normally don't get out of 4th gear much. In 4th gear at 2500 rpm I'm a little over 60 mph, so I can still hit 70 mph with out a problem
A turbo would really make it sweat for pulling and hauling, but the extra hassle isn't worth the money IMHO. As is I'm getting 19 mpg out of it D2 winter blend so it isn't killing me driving it to work. Having a dually with a 12' dump and 4.10 gears would make a fantastic wood hauler. What kind of tranny does it have in it?