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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...

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.

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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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Summit Racing™ Nitrous 3,700-4,100 Stall Torque Converter SUM-700362-BC

Made in the USA Summit Racing™ Nitrous 3,700-4,100 Stall Torque Converter SUM-700362-BC

Summit Racing™ Nitrous 3,700-4,100 Stall Torque Converter SUM-700362-BC

Torque Converter, 10 in. Diameter, Billet Cover, Powerglide, TH350, TH400, 3,700-4,100 Stall, Each

Part Number: SUM-700362-BC

3.0 out of 5 stars ( 2 )

Estimated Ship Date: Today

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Summit Racing™ Nitrous 3,200-3,500 Stall Torque Converter SUM-700361-BC

Made in the USA Summit Racing™ Nitrous 3,200-3,500 Stall Torque Converter SUM-700361-BC

Summit Racing™ Nitrous 3,200-3,500 Stall Torque Converter SUM-700361-BC

Torque Converter, 10 in. Diameter, Billet Cover, Powerglide, TH350, TH400, 3,200-3,500 Stall, Each

Part Number: SUM-700361-BC

3.0 out of 5 stars ( 2 )

Estimated Ship Date: Today

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Hughes Performance Billet 3,000 Stall Torque Converter GM92BILLET30

Hughes Performance Billet 3,000 Stall Torque Converter GM92BILLET30

Hughes Performance Billet 3,000 Stall Torque Converter GM92BILLET30

Torque Converter, Billet, 3,000 rpm Stall, Chevy, TH350, TH400, Powerglide, Each

Part Number: HUP-GM92BILLET30

Not Yet Reviewed

Estimated Ship Date: Today

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

Made in the USA Boss Hog LS Wild Boar Outlaw 3,200-3,500 Stall Torque Converter 47633

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 Plate, TH350, TH400, Powerglide, Each

Part Number: APE-47633

Not Yet Reviewed

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FTI Performance SST Series Custom Stall Torque Converter SST89-6T

FTI Performance SST Series Custom Stall Torque Converter SST89-6T

FTI Performance SST Series Custom Stall Torque Converter SST89-6T

Torque Converters, SST Series, 9 in. Diameter, Aluminum Stator, Diode, Turbo Spline, Custom, THM400, THM350, Each

Part Number: FTI-SST89-6T

Not Yet Reviewed

Estimated Ship Date: Jan 27, 2026 if ordered today

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Estimated Ship Date: Jan 27, 2026 if ordered today

FTI Performance SST Series Custom Stall Torque Converter SST89-0T

FTI Performance SST Series Custom Stall Torque Converter SST89-0T

FTI Performance SST Series Custom Stall Torque Converter SST89-0T

Torque Converters, SST Series, 9 in. Diameter, Aluminum Stator, Diode, Turbo Spline, Custom, THM400, THM350, Each

Part Number: FTI-SST89-0T

Not Yet Reviewed

Estimated Ship Date: Jan 27, 2026 if ordered today

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Estimated Ship Date: Jan 27, 2026 if ordered today

FTI Performance SST Series 3,400-3,800 Stall Torque Converter SST89-0

FTI Performance SST Series 3,400-3,800 Stall Torque Converter SST89-0

FTI Performance SST Series 3,400-3,800 Stall Torque Converter SST89-0

Torque Converters, SST Series, 9 in. Diameter, Aluminum Stator, Diode, Turbo Spline, 3,400-3,800 Stall, THM400, THM350, Each

Part Number: FTI-SST89-0

Not Yet Reviewed

Estimated Ship Date: Jan 27, 2026 if ordered today

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Estimated Ship Date: Jan 27, 2026 if ordered today

FTI Performance SST Series Custom Stall Torque Converter SST89-7

FTI Performance SST Series Custom Stall Torque Converter SST89-7

FTI Performance SST Series Custom Stall Torque Converter SST89-7

Torque Converters, SST Series, 9 in. Diameter, Aluminum Stator, Diode, Turbo Spline, Custom, THM400, THM350, Each

Part Number: FTI-SST89-7

Not Yet Reviewed

Estimated Ship Date: Jan 27, 2026 if ordered today

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Estimated Ship Date: Jan 27, 2026 if ordered today

FTI Performance SST Series 4,200-4,600 Stall Torque Converter SST89-8

FTI Performance SST Series 4,200-4,600 Stall Torque Converter SST89-8

FTI Performance SST Series 4,200-4,600 Stall Torque Converter SST89-8

Torque Converters, SST Series, 9 in. Diameter, Aluminum Stator, Diode, Turbo Spline, 4,200-4,600 Stall, THM400, THM350, Each

Part Number: FTI-SST89-8

Not Yet Reviewed

Estimated Ship Date: Jan 27, 2026 if ordered today

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Estimated Ship Date: Jan 27, 2026 if ordered today

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