JK 1 Ton Dana 60 99-04 Tone Rings 52 Tooth Pair Artec IndustriesDisassemble your 99 04 Unit Bearings and Replace the factory 60 tooth Tone ring with this JK specific 52 tooth Tone ring. Use of this product may result Inch damage to Unit Bearing if not done properly. Please ensure you take care while taking apart the Unit Bearing. Did you know that Superduty Unit Bearings can be taken apart and a new Tone ring can be installed? Of course you didn't because until now, nobody knew. Artec Industries again leading the