* Engine and vehicle weight: A heavier vehicle or a more powerful engine will require a converter with a higher stall speed.
* Intended use: A street car will have different needs than a drag racing vehicle. A street car might prefer a lower stall speed for drivability, while a drag car would benefit from a much higher stall speed for quicker launches.
* Desired performance: Do you prioritize quick acceleration, fuel economy, or a balance of both?
* Transmission modifications: Internal modifications to the Turbo 400 (e.g., higher stall speed or upgraded clutches) will influence converter selection.
Types of Converters and their General Applications:
* Low Stall: These converters have a relatively low stall speed (typically under 2000 RPM). They're best for street cars prioritizing drivability and fuel economy. They provide a smooth engagement and less harsh operation.
* Medium Stall: These offer a balance between drivability and performance, usually stalling between 2000-2800 RPM. They're a popular choice for street/strip vehicles.
* High Stall: These converters have high stall speeds (2800 RPM and above), ideal for drag racing and performance applications. They offer quicker acceleration but can make the car less drivable on the street.
* Specific stall speed converters: Converters are designed with specific stall speeds in mind. The stall speed is crucial and is usually specified in RPM. You'll need to consider your engine's powerband and your desired performance goals to select the right one.
* Different manufacturers: Several reputable manufacturers produce torque converters for the Turbo 400, each with varying designs and performance characteristics. Researching reputable brands like TCI, ATI, Circle D, and others is essential.
In short: To find the best torque converter, you need to specify your vehicle's details and desired performance goals. Consult with a reputable transmission shop or performance parts supplier. They can help you select the appropriate converter based on your specific needs. Don't simply choose the highest stall speed unless you understand the implications for drivability and potential stress on the transmission.
