What is a torque converter stall speed?

Stall speed is the RPM at which the torque converter will lock up and transfer power directly from the engine to the transmission. A higher stall speed, like the 3800 RPM on this converter, is beneficial for performance applications, allowing the engine to rev higher before engaging the transmission for a stronger launch.

What does 'lock-up' mean for a torque converter?

A lock-up torque converter has a clutch that mechanically connects the engine to the transmission at cruising speeds. This reduces slippage, which can improve fuel efficiency and reduce heat buildup compared to a non-lock-up converter.

What transmission models does this converter fit?

This FTI Performance torque converter is designed for early 700R4 and 4L60 transmissions. It features a 30-spline input to match the transmission's output shaft.

FTI Performance Torque Converter 3800 Stall ESRL6391

Name: FTI 9.5in 700R4/4L60(Early) Economy Lock-Up Street Racer Series - 30 Spline - 3800 Stall
Brand: FTI Performance
SKU: fti-performance-fti-9-5in-700r4-4l60-early-economy-lock-up-street-racer-series-3-t14-825917
Price: 706.11 USD
Availability: BackOrder

FTI 9.5in 700R4/4L60(Early) Economy Lock-Up Street Racer Series - 30 Spline - 3800 Stall

$706.11

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

FTI 9.5in lock-up torque converter for 700R4/4L60E (early) transmissions. 3800 stall, 30 spline, rated to 450HP.

Key Features

Fits 102+ vehicle make/model combinations.
9.5-inch diameter housing.
30-spline input shaft.
3800 RPM stall speed.
Lock-up design for improved cruising efficiency.
Rated to handle up to 450 horsepower.

Secure CheckoutFast Shipping631-982-0042

Will this fit your vehicle?

Product Details

This FTI Performance lock-up torque converter features a 30-spline input and is built for a 3800 RPM stall speed, making it a solid choice for street performance applications. It’s designed to handle up to 450 horsepower, offering an improved launch from a standstill compared to stock converters.

The 9.5-inch diameter housing is a common size for performance builds, and this converter is specifically designed for early 700R4 and 4L60 transmissions. The lock-up feature means that at cruising speeds, the converter can mechanically couple the engine and transmission, reducing slippage and improving fuel economy. This is a well-built unit that provides a noticeable difference in acceleration for a wide range of vehicles, from muscle cars like the Chevrolet Camaro and Corvette to trucks like the Chevrolet C1500.

When installing this torque converter, ensure you follow the manufacturer's instructions carefully, especially regarding proper filling with transmission fluid and ensuring it seats fully into the transmission pump before bolting the flexplate to the converter. This unit is not CARB approved and cannot be shipped to California.