Re: switch to 4wd worth it
I'm not an F100 expert but I'd say no.
Pluses: 4 wheel drive ability
Work involved in the swapover (I believe there are differences in the chassis etc to contend with too)
Extra tyre wear
Extra fuel consumption
Possibly an engineers certificate required for the conversion
Parts used to be expensive / difficult to get although I believe this is better now with so many people importing bits
4wd f100s had dual shocks etc so you would need to consider adding them
Easier to find yourself a 4wd one if you need the ability.