Motive Gear GM12-373 Gear, Ring and Pinion, 3.73:1 Ratio, GM, 12-Bolt, Truck, Set Please hover mouse to enlarge image Motive Gear GM12-373 Gear Ring and Pinion 3.73:1 Ratio Carrier Series 4 Cover Bolts 12 Installation Kit Included No Pinion Gear Teeth 11 Pinion Shaft Diameter (in) 1.438 in. Pinion Spline Count 30 Quantity Sold as a set. Ring and Pinion Ratio 3.73:1 Ring Gear Bolts 12 Ring Gear Diameter (in) 8.875 in. Ring Gear Rotation Standard Ring Gear Teeth 41 Summit Racing Part Number : MGR