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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.

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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Hughes Performance Street Master 2,500 Stall Torque Converter GM25

Made in the USA Hughes Performance Street Master 2,500 Stall Torque Converter GM25

Hughes Performance Street Master 2,500 Stall Torque Converter GM25

Torque Converter, Street Rod, 2,500 rpm Stall, Chevy, TH350, TH400, Each

Part Number: HUP-GM25

4.6 out of 5 stars ( 62 )

Estimated Ship Date: Today

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Hughes Performance Street Master 2,500 Stall Torque Converter GM25HD

Made in the USA Hughes Performance Street Master 2,500 Stall Torque Converter GM25HD

Hughes Performance Street Master 2,500 Stall Torque Converter GM25HD

Torque Converter, Street Master, 2,500 rpm Flash Stall, Heavy-duty Sprag, Chevy, TH350, TH400, Each

Part Number: HUP-GM25HD

4.55 out of 5 stars ( 20 )

Estimated Ship Date: Today

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Hughes Performance Street Master 2,500 Stall Torque Converter GM25-400BP

Made in the USA Hughes Performance Street Master 2,500 Stall Torque Converter GM25-400BP

Hughes Performance Street Master 2,500 Stall Torque Converter GM25-400BP

Torque Converter, Street Master, Chevy, TH400, Each

Part Number: HUP-GM25-400BP

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Today

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Hughes Performance Street Master 2,500 Stall Torque Converter GM25-12

Hughes Performance Street Master 2,500 Stall Torque Converter GM25-12

Hughes Performance Street Master 2,500 Stall Torque Converter GM25-12

Torque Converter, Street Master Torque Converter, Street/Strip, 2,500 Stall Speed Rating RPM, 30-spline Input, Chevy THM350/THM400, Each

Part Number: HUP-GM25-12

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Today

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Hughes Performance Street Master 2,500 Stall Torque Converter GM25(BPO)HD

Made in the USA Hughes Performance Street Master 2,500 Stall Torque Converter GM25(BPO)HD

Hughes Performance Street Master 2,500 Stall Torque Converter GM25(BPO)HD

Torque Converter, Street Master, 2,500 rpm Stall, Buick, Pontiac, Oldsmobile, BOP, TH350, TH400, HD Sprag, Each

Part Number: HUP-GM25BPOHD

5.0 out of 5 stars ( 5 )

Estimated Ship Date: Today

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Hughes Performance Street Master 2,500 Stall Torque Converter GM25HDX

Made in the USA Hughes Performance Street Master 2,500 Stall Torque Converter GM25HDX

Hughes Performance Street Master 2,500 Stall Torque Converter GM25HDX

Torque Converter, Street Master, 2,500 rpm Stall, Chevy, TH350, TH400, Each

Part Number: HUP-GM25HDX

Not Yet Reviewed

Estimated Ship Date: Feb 18, 2026 if ordered today

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Estimated Ship Date: Feb 18, 2026 if ordered today

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Hughes Performance Street Master 2,500 Stall Torque Converter GM25

Hughes Performance Street Master 2,500 Stall Torque Converter GM25

4.5 out of 5 stars ( 62 )

Estimated Ship Date: Today

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Hays Twister Full Race 3,600-4,200 Stall Torque Converter 97-1D36F

Hays Twister Full Race 3,600-4,200 Stall Torque Converter 97-1D36F

Hays Twister Full Race 3,600-4,200 Stall Torque Converter 97-1D36F

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: Feb 11, 2026 if ordered today

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Estimated Ship Date: Feb 11, 2026 if ordered today

Hughes Performance Street Master 2,500 Stall Torque Converter GM25(BPO)400BP

Made in the USA Hughes Performance Street Master 2,500 Stall Torque Converter GM25(BPO)400BP

Hughes Performance Street Master 2,500 Stall Torque Converter GM25(BPO)400BP

Torque Converter, Street Master, Buick, Pontiac, Oldsmobile, BOP, TH400, Each

Part Number: HUP-GM25BPO400BP

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Feb 17, 2026 if ordered today

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Estimated Ship Date: Feb 17, 2026 if ordered today

Hughes Performance Street Master 2,500 Stall Torque Converter GM25HDXLS

Made in the USA Hughes Performance Street Master 2,500 Stall Torque Converter GM25HDXLS

Hughes Performance Street Master 2,500 Stall Torque Converter GM25HDXLS

Torque Converter, Street Rod, 2,500 rpm Stall, Chevy LS, TH350, TH400, Each

Part Number: HUP-GM25HDXLS

Not Yet Reviewed

Estimated Ship Date: Feb 17, 2026 if ordered today

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Estimated Ship Date: Feb 17, 2026 if ordered today

Hays Twister Full Race 2,400-2,800 Stall Torque Converter 97-1D24F

Hays Twister Full Race 2,400-2,800 Stall Torque Converter 97-1D24F

Hays Twister Full Race 2,400-2,800 Stall Torque Converter 97-1D24F

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: Feb 11, 2026 if ordered today

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Estimated Ship Date: Feb 11, 2026 if ordered today

Hays Twister Full Race 4,200-4,500 Stall Torque Converter 97-1D42F

Hays Twister Full Race 4,200-4,500 Stall Torque Converter 97-1D42F

Hays Twister Full Race 4,200-4,500 Stall Torque Converter 97-1D42F

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: Feb 11, 2026 if ordered today

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Estimated Ship Date: Feb 11, 2026 if ordered today

Hays Twister Full Race 2,800-3,200 Stall Torque Converter 97-1D28F

Hays Twister Full Race 2,800-3,200 Stall Torque Converter 97-1D28F

Hays Twister Full Race 2,800-3,200 Stall Torque Converter 97-1D28F

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

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Feb 11, 2026 if ordered today

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Estimated Ship Date: Feb 11, 2026 if ordered today

Hays Twister Full Race 3,200-3,600 Stall Torque Converter 97-1D32F

Hays Twister Full Race 3,200-3,600 Stall Torque Converter 97-1D32F

Hays Twister Full Race 3,200-3,600 Stall Torque Converter 97-1D32F

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: Feb 11, 2026 if ordered today

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Estimated Ship Date: Feb 11, 2026 if ordered today

B&M Tork Master 2,300-2,500 Stall Torque Converter 20404

B&M Tork Master 2,300-2,500 Stall Torque Converter 20404

B&M Tork Master 2,300-2,500 Stall Torque Converter 20404

Torque Converter, Tork Master, 2,300-2,500 rpm Stall Range, Chevy, THM350/THM400, Each

Part Number: BMM-20404

4.42 out of 5 stars ( 38 )

Estimated Ship Date: Today

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Summit Racing™ 2,200-2,800 Stall Torque Converter SUM-G2703

Summit Racing™ 2,200-2,800 Stall Torque Converter SUM-G2703

Summit Racing™ 2,200-2,800 Stall Torque Converter SUM-G2703

Torque Converter, 10 in. Diameter, TH350/TH400, 2,200-2,800 Stall, Each

Part Number: SUM-G2703

4.41 out of 5 stars ( 34 )

Estimated Ship Date: Today

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Summit Racing™ 1,700-2,100 Stall Torque Converter SUM-G2699

Made in the USA Summit Racing™ 1,700-2,100 Stall Torque Converter SUM-G2699

Summit Racing™ 1,700-2,100 Stall Torque Converter SUM-G2699

Torque Converter, 12 in. Diameter, Chevrolet, TH350/TH400, 1,700-2,100 Stall, Each

Part Number: SUM-G2699

4.12 out of 5 stars ( 116 )

Estimated Ship Date: Today

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Summit Racing™ 2,000-2,400 Stall Torque Converter SUM-G2701

Summit Racing™ 2,000-2,400 Stall Torque Converter SUM-G2701

Summit Racing™ 2,000-2,400 Stall Torque Converter SUM-G2701

Torque Converter, 10 in. Diameter, Chevy, TH350/TH400, 2,000-2,400 Stall, Each

Part Number: SUM-G2701

3.18 out of 5 stars ( 17 )

Estimated Ship Date: Today

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B&M Tork Master 1,900-2,100 Stall Torque Converter 20400

B&M Tork Master 1,900-2,100 Stall Torque Converter 20400

B&M Tork Master 1,900-2,100 Stall Torque Converter 20400

Torque Converter, Tork Master, 1,900-2,100 rpm Stall Range, Chevy, THM350/THM400, Each

Part Number: BMM-20400

4.32 out of 5 stars ( 77 )

Estimated Ship Date: Today

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Summit Racing™ Nitrous 2,800-3,200 Stall Torque Converter SUM-700360-BC

Made in the USA Summit Racing™ Nitrous 2,800-3,200 Stall Torque Converter SUM-700360-BC

Summit Racing™ Nitrous 2,800-3,200 Stall Torque Converter SUM-700360-BC

Torque Converter, 10 in. Diameter, Billet Cover, Powerglide, TH350, TH400, 2,800-3,200 Stall, Each

Part Number: SUM-700360-BC

5.0 out of 5 stars ( 3 )

Estimated Ship Date: Today

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Allstar Performance 2,200-2,600 Stall Torque Converter ALL26906

Allstar Performance 2,200-2,600 Stall Torque Converter ALL26906

Allstar Performance 2,200-2,600 Stall Torque Converter ALL26906

Torque Converter, 30-spline, Furnace-brazed, 10.750 in. Bolt Pattern, Chevy, TH350, TH400

Part Number: AAF-ALL26906

3.5 out of 5 stars ( 4 )

Estimated Ship Date: Today

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TCI Breakaway 2,400-2,600 Stall Torque Converter 240900

Made in the USA TCI Breakaway 2,400-2,600 Stall Torque Converter 240900

TCI Breakaway 2,400-2,600 Stall Torque Converter 240900

Torque Converter, Breakaway, Chevy, TH350/TH400, Each

Part Number: TCI-240900

4.29 out of 5 stars ( 24 )

Estimated Ship Date: Today

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TCI Saturday Night Special 1,600-2,000 Stall Torque Converter 241500-A

Made in the USA TCI Saturday Night Special 1,600-2,000 Stall Torque Converter 241500-A

TCI Saturday Night Special 1,600-2,000 Stall Torque Converter 241500-A

Torque Converter, Saturday Night Special, Chevy, TH350, TH400, 12 in. Diameter, Each

Part Number: TCI-241500-A

3.18 out of 5 stars ( 17 )

Estimated Ship Date: Today

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FTI Performance ESR Series 3,400-3,600 Stall Torque Converter ESR6082

FTI Performance ESR Series 3,400-3,600 Stall Torque Converter ESR6082

FTI Performance ESR Series 3,400-3,600 Stall Torque Converter ESR6082

Torque Converter, ESR Series, 9.50 in. Diameter, 3,400 to 3,600 rpm Flash Stall, TH350, TH400, Each

Part Number: FTI-ESR6082

4.78 out of 5 stars ( 9 )

Estimated Ship Date: Today

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B&M Holeshot 2,300-2,500 Stall Torque Converter 20412

B&M Holeshot 2,300-2,500 Stall Torque Converter 20412

B&M Holeshot 2,300-2,500 Stall Torque Converter 20412

Torque Converter, Holeshot, 2,300-2,500 rpm Stall Range, Chevy, THM350/THM400, Each

Part Number: BMM-20412

3.8 out of 5 stars ( 15 )

Estimated Ship Date: Today

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