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I think you are confusing "wheelbase", which is the distance from front to rear between the axles, and track width, which is the distance between the wheels on one axle?
If you have a 48-52 F-2 you can replace the rear axle housing with one from a 57-72 Ford F-1 pickup. If you are still running an original engine try to find one with a ratio of about 3.25 to 3.50. Bolt pattern will be 5x5.5 instead of 8-bolt. You can put F-1 brakes and hubs on the front axle and then have 5x5.5 all around. If you do not wish to change the bolt pattern you might try an F-250 rear end of the same years but finding a 3.25 ratio for that rear end will be more difficult...
It isn't completely a "drop-in", read the article I linked in Post #4 to see the driveshaft mods, pinion angle correction, and spring plate modifications needed.