High performance Yukon Ring & Pinion gear set for GM 8.25" IFS Reverse rotation in a 3.42 ratio. Yukon Ring & Pinion sets give you the confidence of knowing you?re running gears designed for the harshest of conditions. Whether it?s on the street, off-road, or at the track; Yukon ring & pinion sets deliver unrivaled performance & quality. Yukon uses the latest designs and manufacturing technologies to provide a quiet running gear that is strong and easy to set up. All Yukon ring & pinion sets come standard with a one-year warranty. 2010 GM 8.25 IFS use a different deck height carrier. In order to use 2009 and older gears YCG26018131 case must be used with it. All the Bearings that are in the YK GM8.25IFS-B work fine 2010 GM 8.25IFS Front ends equipped w/ factory 3.08 gear will need a new carrier when changing ratio. When purchasing 3.42 & up gears for a factory 3.08 application you must also purchase a YC G26018131 case with it. Deck Height w/ 3.08 Ratio 1.780? Deck height w/ 3.42 & up Ratio 1.920?