Yukon Steel Spool For GM 14 Bolt Truck With 30 Spline Axles 4.10 And Down Yukon Gear & AxleYukon performance spools are made from the highest quality materials to ensure high strength and long life in performance applications. Details: Fits GM 10. 5 inch 14 bolt truck with 30 spline axles 4. 10 and down ratio only or 4. 56 and up thick gears Provides 100 percent traction to both wheels at all times Not recommended for street driven vehicles Machined from high quality steel alloy Limited Lifetime Warranty Against Manufacturer Defects Sold As