yeah they sit close to 2 inches higher from what i can tell when my cousin comes over in his he put 32 at;s on his fx-4 and it doesnt rub unless he stuffs the tires pretty well which he hardly wheels so not much of an issue,,My neighbor has a 04 ranger 4by and he just put some 31 inch mastercraft m/ts on it and they seem to be doin ok so far not sure if he rubs them though.
The FX's have "stiffer shocks" than the regular 4x4. Other than that (which I don't see raising the truck any), there aren't any major suspension differences (block height, etc).
Knowing that body-styles haven't changed... my '02 ranger I could fit 31x9.50's (yes, 9.50's), stock. However, a 10.50 (on stock 16" rim) would end up rubbing the rear fenders on full flex (at the peak of the fender, not the front/rear bends like most trucks would).
The front, unless you go like 11.50+ width, you should be fine (on stock rims) - just because there's no flex, and bottoming out on the fenders would only be an issue when fully turned when hitting a big whoop (which will beg pardon to your CV's first).
All that said, I know the p245's will fit (see my profile/rides... since the 245's are stock on the ranger 4x4's (or so I thought), and those are smaller than the 31x10.50, but also never rubbed/touched anything.
If you're not fully flexing out the a$$-end or flying through whoops, up to a 32x10.50 should be fine.
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