GM 4L80 Transmission Billet Aluminum Full Manual Valve Body - Black These Speedmaster main bearings are

These Speedmaster main bearings are just what you need to freshen up your engine

Available in different bore diameters to suit your specific engine's needs

Designed for precision fitment and easy installation

All of our components are heavy duty performance upgrades of their stock counterparts but are manufactured to the original tolerances and specifications

GM 4L80 Transmission Billet Aluminum Full Manual Valve Body - Black These Speedmaster main bearings areSpeedmaster billet aluminum valve bodies are a direct replacement for your original valve body. These valve bodies shift quickly and incorporate an adjustable pressure regulator. Fully 5 axis CNC machined from billet aluminum, these valve bodies will help your project shed some weight.