Torque Converter
Calculator
Calculate the ideal torque converter stall speed and sizing for your vehicle. Supports 4L60E, 4L80E, 700R4, TH350, 6L80E, and 40 series converters. Free automotive calculator for performance builds and replacements.
How to Use the Torque Converter Calculator
Enter your vehicle specifications to calculate the optimal torque converter stall speed and type.
What is a Torque Converter?
Understanding the function and importance of torque converters in automatic transmissions.
Power Transfer
Transfers engine power to the transmission using hydraulic fluid coupling, allowing smooth power delivery without mechanical connection.
Torque Multiplication
Multiplies engine torque during acceleration, typically providing 1.8-2.5x torque increase for better launch performance.
Stall Speed
The RPM at which the converter begins transferring power efficiently. Higher stall speeds benefit high-performance engines.
Lockup Function
Modern converters lock up at cruise speeds for improved fuel economy by eliminating slip between engine and transmission.
Popular Torque Converter Types
Common torque converter applications and specifications for different transmission types.
Popular GM transmission converter for light-duty trucks and cars. Stall speeds typically range from 1800-3500 RPM.
Chevrolet Silverado, GMC Sierra, Camaro, Corvette
Heavy-duty GM converter for high-performance and towing applications. Higher torque capacity than 4L60E.
Heavy-duty trucks, performance cars, towing applications
Classic GM overdrive transmission converter. Popular for street rods and muscle car restorations.
1982-1993 GM vehicles, street rods, classic car builds
Legendary 3-speed automatic converter known for durability and performance. No overdrive gear.
Classic muscle cars, drag racing, street performance
Modern 6-speed GM converter with advanced lockup technology for improved fuel economy.
Modern GM trucks, SUVs, performance cars
Ford's C4 and C6 transmission converters. Robust design for performance applications.
Ford Mustang, F-Series trucks, performance builds
Common Torque Converter Symptoms
Recognize the warning signs of torque converter problems before they cause major damage.
Converter clutch not engaging properly, causing vibration during acceleration or at cruise.
Transmission running hot due to converter inefficiency or internal damage.
Vehicle feels sluggish, especially from a stop. May indicate wrong stall speed.
Engine RPM too high at highway speeds, indicating lockup clutch problems.
Metallic rattling sound, especially at idle, may indicate internal converter damage.
Dark, burnt-smelling transmission fluid often indicates converter problems.
Frequently Asked Questions
Common questions about torque converters, sizing, and replacement.
A torque converter transfers power from the engine to the transmission using hydraulic fluid. It allows the engine to run while the vehicle is stopped and multiplies torque during acceleration, similar to a clutch in manual transmissions.
Common signs include transmission slipping, overheating, shuddering during acceleration, rattling noises at idle, contaminated transmission fluid, and poor fuel economy. If you experience these symptoms, have your transmission inspected.
The ideal torque converter size depends on your engine's power band, vehicle weight, gear ratio, and intended use. Street cars typically use 2000-2500 RPM stall, while performance applications may need 2500-3500+ RPM stall speeds.
4L80E converters are larger and stronger, designed for heavy-duty applications with higher torque capacity. 4L60E converters are lighter duty, used in passenger cars and light trucks. They're not interchangeable.
While similar, 700R4 and 4L60E converters have different specifications. The 4L60E uses electronic controls and may have different bolt patterns. Always verify compatibility before swapping converters.
Torque converter replacement typically costs $800-2500 including labor, depending on the vehicle and converter type. High-performance converters cost more, and the transmission usually needs to be removed for replacement.