I had an '89 F250HD with the 5.8L, 5spd manual, to be honest I can't remember if it was the 3.73 or 4.10, but it was always screaming, even in OD, so I think it was the 4.10. It was a pretty gutless truck IMHO. It would pull an equipment trailer with a 6-7000 Bobcat on it, but it didn't like, and big hills were a 50-60km/h 3rd gear proposition. It got about 7-8mpg towing that kinda weight, and maybe 9 towing a two place snowmobile trailer and one in the box, and let's just say I wasn't going to be passing anyone, even with that small load.

My advice, get the 460. The mileage sucks, but the power is there when you need it, besides my mileage sucked with 5.8 too.

Waxy