Yukon Gear High Performance Gear Set For GM 8.5in & 8.6in in a 3.90 Ratio Cooling>Coolants This is a direct bolt-on

This is a direct bolt-on system with all hardware and brackets requires for an easy installation

but it also frees up grille space

two worm-drive clamps

cast water manifold with floating tubes and replace it with a larger inner diameter

CAD modeling

Yukon Gear High Performance Gear Set For GM 8.5in & 8.6in in a 3.90 Ratio Cooling>Coolants This is a direct bolt-onYukon Gear & Axle high performance ring and pinion gear sets are the benchmark of quality in the automotive gear industry. Yukon engineers use state of the art design, advanced heat treating techniques, and leading edge quality testing processes to ensure the structure and surface finish meet exacting specifications and quality standards. Yukon offers its Y. E. S. Plan, a lifetime, comprehensive, no questions asked protection plan covering your gear