Build a Bombproof 4L80E Manual Valvebody Transmission
4L80E Manual Valve Gently Oversized to Fit Existing Bore (No Reaming) - Global Transmission Parts
4L80E Race Transmission (4x4), Manual Shift with Trans-Brake for Sale in Joliet, IL | RacingJunk
4L80E 4L85E Full Manual Valve Body Conversion Kit
Hughes Performance - HP - HP25-2 -Hughes Performance 4L80E Transmission Assembly Full Manual -2WD Cars & Trucks -Chevy Bellhousing - Use For Street Rod Retrofits Race Cars Etc.
How to wire your 4L80e to full manual DIY - YouTube