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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.
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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Torque Converter, 8 in. Race, TH350, TH400, PG With Turbo Splines, Each
Part Number: SUM-701109
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Torque Converter, 8 in. Race, TH350, TH400, PG With Turbo Splines, Each
Part Number: SUM-701106
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Torque Converters, SST Series, 9 in. Diameter, Aluminum Stator, Diode, Turbo Spline, Custom, THM400, THM350, Each
Part Number: FTI-SST89-6T
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Estimated Ship Date: Dec 12, 2025 if ordered today
Estimated Ship Date: Dec 12, 2025 if ordered today
Torque Converter, 8 in. Race, TH350, TH400, PG With Turbo Splines, Each
Part Number: SUM-701111
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Torque Converter, 9 in. Race, TH350, TH400, PG With Turbo Splines, Each
Part Number: SUM-701117
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Torque Converter, 10 in. Race, TH350, TH400, PG With Turbo Splines, Each
Part Number: SUM-701119
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Torque Converter, 9 in. Race, TH350, TH400, PG With Turbo Splines, Each
Part Number: SUM-701116
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Torque Converter, 8 in. Race, TH350, TH400, PG With Turbo Splines, Each
Part Number: SUM-701105
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Estimated Ship Date: Today
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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: Dec 12, 2025 if ordered today
Estimated Ship Date: Dec 12, 2025 if ordered today
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: Dec 12, 2025 if ordered today
Estimated Ship Date: Dec 12, 2025 if ordered today
Torque Converters, SST Series, 9 in. Diameter, Aluminum Stator, Diode, Turbo Spline, Custom, THM400, THM350, Each
Part Number: FTI-SST89-7
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Estimated Ship Date: Dec 12, 2025 if ordered today
Estimated Ship Date: Dec 12, 2025 if ordered today
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: Dec 12, 2025 if ordered today
Estimated Ship Date: Dec 12, 2025 if ordered today
Torque Converter, 9 in. Race, TH350, TH400, PG With Turbo Splines, Each
Part Number: SUM-701115
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Estimated Ship Date: Today
Estimated Ship Date: Today
Torque Converter, 10 in. Race, TH350, TH400, PG With Turbo Splines, Each
Part Number: SUM-701118
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Estimated Ship Date: Today
Estimated Ship Date: Today
Torque Converter, 8 in. Race, TH350, TH400, PG With Turbo Splines, Each
Part Number: SUM-701102
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Estimated Ship Date: Today
Estimated Ship Date: Today
Torque Converters, Twister Full Race, 2,400-2,800 rpm Stall Speed Range, 30-spline, 9.600 in. Diameter, Chevrolet THM400, Buick, Chevy, Jeep, Each
Part Number: HAY-97-1D24F
Not Yet Reviewed
Estimated Ship Date: Dec 3, 2025 if ordered today
Estimated Ship Date: Dec 3, 2025 if ordered today
This product may not be eligible for select promotional offers
Torque Converters, Twister Full Race, 2,800-3,200 rpm Stall Speed Range, 30-spline, 9.600 in. Diameter, Chevrolet THM400, Buick, Chevy, Jeep, Each
Part Number: HAY-97-1D28F
Estimated Ship Date: Dec 3, 2025 if ordered today
Estimated Ship Date: Dec 3, 2025 if ordered today
This product may not be eligible for select promotional offers
Torque Converters, Twister Full Race, 3,200-3,600 rpm Stall Speed Range, 30-spline, 9.600 in. Diameter, Chevrolet THM400, Buick, Chevy, Jeep, Each
Part Number: HAY-97-1D32F
Not Yet Reviewed
Estimated Ship Date: Dec 3, 2025 if ordered today
Estimated Ship Date: Dec 3, 2025 if ordered today
This product may not be eligible for select promotional offers
Torque Converters, Twister Full Race, 3,600-4,200 rpm Stall Speed Range, 30-spline, 9.600 in. Diameter, Chevrolet THM400, Buick, Chevy, Jeep, Each
Part Number: HAY-97-1D36F
Not Yet Reviewed
Estimated Ship Date: Dec 2, 2025 if ordered today
Estimated Ship Date: Dec 2, 2025 if ordered today
This product may not be eligible for select promotional offers
Torque Converters, Twister Full Race, 4,200-4,500 rpm Stall Speed Range, 30-spline, 9.600 in. Diameter, Chevrolet THM400, Buick, Chevy, Jeep, Each
Part Number: HAY-97-1D42F
Not Yet Reviewed
Estimated Ship Date: Dec 3, 2025 if ordered today
Estimated Ship Date: Dec 3, 2025 if ordered today
This product may not be eligible for select promotional offers
Torque Converter, Tork Master, 2,300-2,500 rpm Stall Range, Chevy, THM350/THM400, Each
Part Number: BMM-20404
Estimated Ship Date: Today
Estimated Ship Date: Today
This product may not be eligible for select promotional offers
Torque Converter, Tork Master, 1,900-2,100 rpm Stall Range, Chevy, THM350/THM400, Each
Part Number: BMM-20400
Estimated Ship Date: Today
Estimated Ship Date: Today
This product may not be eligible for select promotional offers
Torque Converter, Holeshot, 2,900-3,200 rpm Stall Range, GM, THM350/THM400, Each
Part Number: BMM-20483
Estimated Ship Date: Today
Estimated Ship Date: Today
This product may not be eligible for select promotional offers
Torque Converter, Holeshot, 1,800-2,200 rpm Stall Range, Chevy, THM350/THM400, Each
Part Number: BMM-20416
Estimated Ship Date: Today
Estimated Ship Date: Today
This product may not be eligible for select promotional offers
Torque Converter, Holeshot, 2,300-2,500 rpm Stall Range, Chevy, THM350/THM400, Each
Part Number: BMM-20412
Estimated Ship Date: Today
Estimated Ship Date: Today
This product may not be eligible for select promotional offers
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Summit Racing™ Pro Bracket Race 4,400-6,000 Stall Torque Converter SUM-701106
