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Durable Dana 80 Gear Set: Designed for rear axle applications, this 4.88 ratio ring and pinion gear set delivers reliable performance in heavy-duty vehicles like Chevy Kodiak and GMC Topkick. Premium 8620 Steel Material: Built with high-strength 8620 steel, ensuring exceptional durability, wear resistance, and long-lasting performance under demanding driving conditions. Precision Fit for Dana 80 Axles: Features an 11.25 ring gear diameter with 12 bolts and a pinion spline count of 37, compatible with 4.10 ratio carrier and numerically higher setups. Wide Compatibility Range: Fits 2003-2009 Chevy Kodiak C4500, C5500, C6500, C7500, and GMC Topkick C4500, C5500, C6500, C7500, meeting the needs of medium-duty trucks. Warranty-Backed Quality: Covered by a 1-year or 50,000-mile warranty, offering peace of mind and dependable performance for professional drivers and fleet operators. ASIN B001P23R9I Brand Motive Gear Model Motive Gear D80-488 Differential Ring and Pinion Exterior Machined Item Weight 0.01 ounces Manufacturer Motive Gear OEM Part Number D80-488 Item model number D80-488 Product Dimensions 15.5 x 11 x 5.25 inches Manufacturer Part Number D80-488