GM 10.5" - 14-Bolt Thick-Cut Ring & Pinion Gears - 5.13 Ratio - Chevy GMC Rearend * 8620 Heat-Treated Material * Fits 4.10 & Numerically Lower Carriers * Premium Quality Gear - Easy to Setup * Off-Road, Street, Strip, ETC 1 Year Warranty Against Defects in Workmanship