4L60E .490 Boost Valve w/ O-Ring.

The TCI GM Transmission Front Pump Assemblies with our 10-Vane Billet Rotor Kit provide superior performance over factory 10-vane systems and 13-vane aftermarket kits. Machined from 8620 billet steel rather than OE powdered metal material, a substantial amount of strength is added. Custom designed and tested at the TCI R&D center, these pumps are simple to install because they are a direct bolt-in replacement for the stock piece and ensure proper fluid circulation and consistent line pressure in any level of performance application.