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Before getting started, let's run down the parts that are going into this build. The Yukon Ring & Pinion (PN YG GM8.2-355) is a standard 8.2 3.55 gear ratio that is made of 8620 steel. We decided to go with middle of the road gears like the 3.55s, though these diffs were fitted with up to 4.11s from the factory. When used with an overdrive tranny, the 3.55s will be highway friendly, as well as giving significantly more torque multiplication over more pedestrian ratios like a 2.73 or 3.08.