Whether you want to call it relentless abuse, or product testing, we've tried nearly all manufacturers of ring and pinion sets, and we've grenaded nearly all of them. To date, Yukon has been the absolute most indestructible set of gears we've ran without fail. High performance Yukon Ring & Pinion gear set for GM 11.5" in a 3.73 to 5.38 ratio. 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. Please verify your correct differential application before ordering gears.