If you've upgraded to larger wheels and tires on your 2011-2016 GM 2500HD/3500HD and experienced a loss of power while driving or towing, aftermarket axle gears are the perfect solution. Regain your truck’s power and efficiency with our selection of OEM-style, precision-crafted rear gears. Whether you're looking for a single gear or a complete set, these rear gears will help restore your truck's performance to like-new condition. Find the perfect fit at Alligator Performance. Equip your gears with a quality Install Kits to ensure they run flawlessly. GM Duramax Fitments: 2011, 2012, 2013, 2014, 2015, 2016 GM 6.6L Duramax.Submodel Fitments: WT, Custom, LT, LTZ, High Country, 1LT, 2LT, Pro, SLE, SLT, AT4, Denali.Some exceptions apply, please see individual product pages for specific fitments.