Motive Gear GM12-373X Gear, Ring and Pinion, 3.73:1 Ratio, GM, 12-Bolt, Truck, Set Motive Gear GM12-373X Gear Ring and Pinion 3.73:1 Ratio Cover Bolts 12 Installation Kit Included No Notes Designed to fit 2.76:1 to 3.42:1 series carriers. Pinion Gear Teet