Steel Spool For Dana 80 4.10 And Up Yukon Gear & AxleYukon performance spools are made from the highest quality materials to ensure high strength and long life in performance applications. Details: Fits Chrysler Dana Spicer 80 with 37 spline axles 4. 10 and up ratio only 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 Each Fits Vehicles: Chevrolet