This listing is for a rebuilt GM Turbo 400 (TH400) automatic transmission, professionally assembled to handle up to 800 horsepower. The TH400 is widely regarded as one of the strongest and most reliable GM automatic transmissions ever made, making it ideal for high-horsepower street cars, drag racing, muscle cars, hot rods, and performance builds.

Every transmission is fully disassembled, inspected, upgraded, and reassembled to ensure durability, firm shifting, and long service life under extreme power levels.

Performance Build Features

• 800 HP capable TH400 build
• Heavy-duty performance clutch packs
• 6 clutch direct drum
• upgraded intermediate clutch snap ring
• High-strength steels
• Rollerized rear gear train
• dual fed direct drum
• Upgraded valve body for firm shifts
• New seals, gaskets, and bushings throughout
• Fully cleaned, assembled, and dyno tested

Vehicle Compatibility

Fits many GM rear-wheel-drive applications, including:

• Chevy muscle cars
• Street / strip builds
• Drag race cars
• Hot rods
• Custom performance vehicles