HiLift and the Ford F250
Based on experience, I have been in this situation many times as I drive an F250 SD with 5" lift, 37" - 40" tires, winches, skidplates, etc., on the trails of the northeast. I would agree with the previous postings, you will need a 60", but be careful... the front weight of the truck will max the jack and you will actually get a fair amount of deformation (once you have the load in the air) i.e., the jack will bend under the load and the lift head could actually bind on the beam. However, I limit the amount of lift by using a 2"/10-15K lb. racheting tie-down (safer than a snatch chain) to conpress or at least stop suspension droop when you jack it up. This will also reduce the chance of damage to your front diff and spread the load over a greater area. The less you raise it the less the beam will deform. However, (unless necessary) I always use an appropriately sized bottlejack, it's just safer, in the long run.