Yukon Gear Steel Spool For GM 8.5in & 8.6in w/ 30 Spline Axles

This Yukon Gear & Axle spool is forged from 8620 steel and heat-treated for added strength, making it a solid choice for converting your GM 8.5-inch or 8.6-inch rear end to a 100% locked differential. It installs directly in place of your existing differential carrier assembly, simplifying the swap. This type of setup is ideal for vehicles dedicated to off-road use or drag racing where maximum traction is essential, as it ensures both rear wheels receive power at all times. It's designed for axles with 30 spline count and requires gear ratios of 2.73 or numerically higher.

Because it locks both wheels together, this spool is not recommended for street-driven vehicles, as it can make turning more difficult and increase tire wear. The 8620 steel construction and heat treatment are key to handling the stresses of performance applications. This spool fits a wide range of GM vehicles, including popular models like the Chevrolet C1500, Buick Regal, and Cadillac Escalade, among many others, provided they have the correct axle and spline count.