Yukon Gear Steel Spool For GM 8.5in & 8.6in w/ 30 Spline Axles - YP FSGM8.5-30

Yukon Full Spools are a cost-effective way to convert a diff to 100% lockup. Installation is easy as they install in place of your differential carrier assembly. Each Yukon spool is made from high-quality 8620 steel and heat treated for additional strength. A spool is an outstanding choice for dedicated off-road and drag racing vehicles only.

• Fits GM 8.5" with 30 spline axles
• 2.73 and up ratios only
• Provides 100% traction to both wheels at all times
• Not recommended for street driven vehicles