TH400 Torque Converters
The Turbo 400 (TH400) is one of the strongest, most proven automatic transmissions ever built. Non-lockup and nearly indestructible, it's a longtime favorite for drag racing, big-block muscle, and turbo and nitrous combinations.
The right torque converter transforms how a TH400 launches and performs:
- Consistent, hard launches
- Efficient power transfer with big horsepower
- Reliability behind power adders
- Repeatable elapsed times
Boss Hog Torque Converters builds TH400 converters for everything from street/strip big-blocks to maximum-effort race combinations, matched to your exact build.
Common Applications
Choosing Your Stall Speed
2,500–3,000 RPM
Best for
Street/strip big-block and muscle car builds
3,000–3,800 RPM
Best for
Bracket racing and cammed combinations
3,800–4,800 RPM
Best for
Turbo, nitrous and high-horsepower race builds
4,800+ RPM
Best for
Dedicated drag racing and maximum-effort combinations
Frequently Asked Questions
Why is the TH400 so popular for racing?
The TH400 is prized for its strength and reliability behind high-horsepower and power-adder combinations. It's a proven platform for drag and street/strip builds.
Does a TH400 use a lockup converter?
The classic TH400 is a non-lockup transmission, so it runs a non-lockup converter, simple and strong for racing.
Recommended Series
Night Stalker
Street-friendly performance for daily-driven and mildly-modified builds.
Shop the series →Street Bandit
Street & strip converters for cammed engines and weekend racing.
Shop the series →Out Law
Maximum-effort converters for turbo, nitrous and dedicated race combos.
Shop the series →Need help choosing a TH400 converter?
Use our Converter Finder or talk with a Boss Hog specialist to get matched to your exact combination.
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