TH400 Torque Converters & TH400 Stall Converters

The Turbo Hydra-Matic 400 automatic transmission is the heavy-duty version of the TH350. Starting in the 1960s, TH400s were found in heavier, more powerful GM vehicles,...

The Turbo Hydra-Matic 400 automatic transmission is the heavy-duty version of the TH350. Starting in the 1960s, TH400s were found in heavier, more powerful GM vehicles, like trucks. Because of their strength, reliability, and their compatibility with small and big block Chevy engines, they became popular options for performance builds, like race cars and off-road vehicles.

A torque converter—also called a stall converter when it features higher stall speed—is a fluid coupler that transfers power from your engine’s flexplate to the transmission. It’s roughly equivalent to the clutch on a manual transmission vehicle. For more details on how they work and how to choose one for your application, check out this video on our blog, On All Cylinders.

Your stock converter is fine for everyday driving, but an aftermarket converter can change the way your TH400 transmission performs. Generally, a higher stall speed can help you launch harder, while a lower stall speed is great for towing. The heat and pressure created by high horsepower can also cause ordinary converters to “balloon” or expand, causing misalignment and damage. Most aftermarket converters are reinforced with anti-ballooning features to survive these conditions.

Top Brands

As the vital link between your engine and your TH400 automatic transmission, you need a reliable torque converter that can handle the demands of performance driving. Summit Racing Equipment only carries converters from trusted name brands like TCI Auto, Hughes, B&M, Hays, Allstar Performance, and more. They’re the parts we use on our own project vehicles!

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Boss Hog Street Bandit 2,400-2,800 Stall Torque Converter 46022

Boss Hog Street Bandit 2,400-2,800 Stall Torque Converter 46022

Torque Converter, Street Bandit, 9.6 in. Diameter, 2,400-2,800 Stall, GM, TH400, Each

Part Number: APE-46022

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Boss Hog Street Bandit 2,800-3,200 Stall Torque Converter 46013

Torque Converter, Street Bandit, 9.6 in. Diameter, 2,800-3,200 Stall, GM, TH400, Each

Part Number: APE-46013

4.5 out of 5 stars ( 2 )

Estimated Ship Date: Tomorrow

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Boss Hog Street Bandit 3,200-3,500 Stall Torque Converter 46033

Torque Converter, Street Bandit, 9.6 in. Diameter, 3,200-3,500 Stall, GM, TH400, Each

Part Number: APE-46033

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Boss Hog Night Stalker 2,200-2,800 Stall Torque Converter 46012

Torque Converter, Night Stalker, 12 in. Diameter, 2,200-2,800 Stall, GM, TH400, Each

Part Number: APE-46012

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Tomorrow

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Boss Hog Night Stalker 1,600-2,200 Stall Torque Converter 46011

Torque Converter, Night Stalker, 12 in. Diameter, 1,600-2,200 Stall, GM, TH400, Each

Part Number: APE-46011

1.57 out of 5 stars ( 7 )

Estimated Ship Date: Tomorrow

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Boss Hog Night Stalker Stock Stall Torque Converter 46000

Torque Converter, Night Stalker, 12 in. Diameter, Stock, GM, TH400, Each

Part Number: APE-46000

1.0 out of 5 stars ( 2 )

Estimated Ship Date: Tomorrow

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Boss Hog LS Wild Boar Outlaw 3,200-3,500 Stall Torque Converter 47633

Torque Converter, Outlaw, LS, 9.60 in., 3,200-3,500 Stall, 30-spline, 11.063 in. Bolt Circle, Anti-Balloning, Direct Fit, TH350/400, Powerglide, Each

Part Number: APE-47633

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Boss Hog Wild Boar Outlaw 4,200-5,000 Stall Torque Converter 46715

Torque Converter, Wild Boar Outlaw, 9.6 in. Diameter, 4,200-5,000 Stall, GM, TH400, Each

Part Number: APE-46715

Not Yet Reviewed

Estimated Ship Date: May 20, 2026 if ordered today

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Estimated Ship Date: May 20, 2026 if ordered today

Need It Sooner? We recommend these similar substitute parts:

Hughes Performance Pro Competition 45 Series Torque Converters GM45

5 out of 5 stars ( 3 )

Estimated Ship Date: Tomorrow

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Boss Hog Street Bandit 4,200-5,000 Stall Torque Converter 46015

Torque Converter, Street Bandit, 9.6 in. Diameter, 4,200-5,000 Stall, GM, TH400, Each

Part Number: APE-46015

Not Yet Reviewed

Estimated Ship Date: May 19, 2026 if ordered today

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Estimated Ship Date: May 19, 2026 if ordered today

Boss Hog Night Stalker Torque Converters 4601HD

Torque Converter, Night Stalker, 12 in. Diameter, Truck/Towing, GM, TH400, Each

Part Number: APE-4601HD

1.0 out of 5 stars ( 1 )

Estimated Ship Date: May 19, 2026 if ordered today

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Estimated Ship Date: May 19, 2026 if ordered today

Boss Hog LS Street Bandit 2,400-2,800 Stall Torque Converter 47322

Torque Converter, Street Bandit, LS, 9.600 in. Diameter, 2,400-2,800 Stall, 30-spline, 11.063 in. Bolt Circle, Direct Fit, TH350/400, Powerglide, Each

Part Number: APE-47322

Not Yet Reviewed

Estimated Ship Date: May 19, 2026 if ordered today

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Estimated Ship Date: May 19, 2026 if ordered today

Boss Hog Street Bandit 3,500-4,200 Stall Torque Converter 46014

Torque Converter, Street Bandit, 9.6 in. Diameter, 3,500-4,200 Stall, GM, TH400, Each

Part Number: APE-46014

Not Yet Reviewed

Estimated Ship Date: May 19, 2026 if ordered today

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Estimated Ship Date: May 19, 2026 if ordered today

Boss Hog Wild Boar Outlaw 2,400-2,800 Stall Torque Converter 46732

Torque Converter, Wild Boar Outlaw, 9.6 in. Diameter, 2,400-2,800 Stall, GM, TH400, Each

Part Number: APE-46732

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

Boss Hog Wild Boar Outlaw 2,400-2,800 Stall Torque Converter 46722

Torque Converter, Outlaw, Chevy, TH400, Each

Part Number: APE-46722

Not Yet Reviewed

Estimated Ship Date: May 21, 2026 if ordered today

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Estimated Ship Date: May 21, 2026 if ordered today

Boss Hog Wild Boar Outlaw 3,200-3,500 Stall Torque Converter 46733

Torque Converter, Wild Boar Outlaw, 9.6 in. Diameter, 3,200-3,500 Stall, GM, TH400, Each

Part Number: APE-46733

Not Yet Reviewed

Estimated Ship Date: May 19, 2026 if ordered today

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Estimated Ship Date: May 19, 2026 if ordered today

Boss Hog Wild Boar Outlaw 3,500-4,200 Stall Torque Converter 46714

Torque Converter, Wild Boar Outlaw, 9.6 in. Diameter, 3,500-4,200 Stall, GM, TH400, Each

Part Number: APE-46714

Not Yet Reviewed

Estimated Ship Date: May 19, 2026 if ordered today

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Estimated Ship Date: May 19, 2026 if ordered today

Boss Hog Wild Boar Outlaw 2,800-3,200 Stall Torque Converter 46713

Torque Converter, Wild Boar Outlaw, 9.6 in. Diameter, 2,800-3,200 Stall, GM, TH400, Each

Part Number: APE-46713

Not Yet Reviewed

Estimated Ship Date: May 19, 2026 if ordered today

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Estimated Ship Date: May 19, 2026 if ordered today

Boss Hog LS Wild Boar Outlaw 2,400-2,800 Stall Torque Converter 47632

Torque Converter, Outlaw, LS, 9.60 in., 2,400-2,800 Stall, 30-spline, 11.063 in. Bolt Circle, Anti-Balloning, Direct Fit, TH350/400, Powerglide, Each

Part Number: APE-47632

Not Yet Reviewed

Estimated Ship Date: May 21, 2026 if ordered today

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Estimated Ship Date: May 21, 2026 if ordered today

Boss Hog LS Wild Boar Outlaw 3,500-4,200 Stall Torque Converter 47614

Torque Converter, Outlaw, LS, 9.60 in., 3,500-4,200 Stall, 30-spline, 11.063 in. Bolt Circle, Anti-Balloning, Direct Fit, TH350/400, Powerglide, Each

Part Number: APE-47614

Not Yet Reviewed

Estimated Ship Date: May 21, 2026 if ordered today

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Estimated Ship Date: May 21, 2026 if ordered today

Boss Hog LS Wild Boar Outlaw 2,800-3,200 Stall Torque Converter 47613

Torque Converter, Outlaw, LS, 9.60 in., 2,800-3,200 Stall, 30-spline, 11.063 in. Bolt Circle, Anti-Balloning, Direct Fit, TH350/400, Powerglide, Each

Part Number: APE-47613

Not Yet Reviewed

Estimated Ship Date: May 21, 2026 if ordered today

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Estimated Ship Date: May 21, 2026 if ordered today

Boss Hog LS Wild Boar Outlaw 4,200-5,000 Stall Torque Converter 47615

Torque Converter, Outlaw, LS, 9.60 in., 4,200-5,000 Stall, 30-spline, 11.063 in. Bolt Circle, Anti-Balloning, Direct Fit, TH350/400, Powerglide, Each

Part Number: APE-47615

Not Yet Reviewed

Estimated Ship Date: May 21, 2026 if ordered today

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Estimated Ship Date: May 21, 2026 if ordered today

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