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14 bolt is stronger it has 3 pinion bearings instead of 2 like all others. The pinion has the 2 standard pinion bearings but it has a third as well. The third one is on the snout of the pinion gear. It gives more strength in keeping the pinion engaged with the ring gear under extreme load.

Well if you wanted to go all out and run the 2 1/2 tons there are gear sets for them. Overson Engineering :: Ouverson :: Hardcore Off-Road Parts has 4.90 gear sets. I think there is another company making gear sets as well. Overson also has everything to make them completely bullet proof.