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Gear Teeth

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Front Dana 30 and Dana 44 and rear Dana 44 axles are pretty durable, but the Dana 35 rear found in all four-cylinder and most six-cylinder TJs is a potential problem area. Anything from broken pinion or ring gear teeth to worn bearings to broken axleshafts are possibilities, so if you're not planning on swapping, take your time and pop the diff cover to be sure.