Have faith Gareth
Gareth,
I know this is not the answer you're looking for, however....
Your F15 2wd should easily do 40mph as it is. The gearbox does have an unsettling note, but you'll get used to it. (at any rate they only get really noisey above 55 mph).
I'm posting this to give you some positive reinforcement about the ability of your machine as it is in standard form & to maybe, prevent you making a costly & unnecessary modification.
If you really really want to do something - go ahead with 20's but dont make the tyre diameter too big (as I have done) or you will never get up a serious hill without electric fuel pumps etc. 10.00X20's should be fine.
You've got a great truck.......enjoy
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Pax Vobiscum.......may you eat three meals a day & have regular bowel movements.
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