What is a 36-element sprag and why is it important?

A sprag is a one-way clutch that allows rotation in one direction and locks in the other. A 36-element sprag has more individual locking elements than smaller sprags, which helps distribute the load over a larger surface area. This generally leads to improved durability and the ability to handle higher torque loads, making it suitable for racing applications.

What is included in this direct drum kit?

This kit provides the billet aluminum direct drum with a 36-element sprag already installed. It also includes the necessary pressure plate and a five-clutch intermediate pack, which are essential components for the direct clutch assembly in a TH400 transmission.

What kind of transmissions is this kit designed for?

This kit is specifically designed for the Turbo 400 (TH400) automatic transmission. It is intended for performance and racing applications where the stock components may not be sufficient to handle increased power and torque.

FTI TH400 Promod Billet Aluminum Drum Kit F4042

Name: FTI TH400 Promod Billet Aluminum Direct Drum Kit w/ 36 Element Sprag
Brand: FTI Performance
SKU: fti-performance-fti-th400-promod-billet-aluminum-direct-drum-kit-w-36-element-sp-t14-847622
Price: 1086.91 USD
Availability: BackOrder

FTI TH400 Promod Billet Aluminum Direct Drum Kit w/ 36 Element Sprag

$1086.91

On Backorder — Expected to ship by May 2, 2026

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

FTI TH400 Promod Billet Aluminum Direct Drum Kit w/ 36 Element Sprag. Includes pressure plate and 5 clutch intermediate pack.

Key Features

This kit includes the FTI Performance TH400 Promod Direct Drum.
Features a 36-element sprag for strong and reliable engagement.
The direct drum is constructed from billet aluminum.
Comes with a pressure plate.
Includes a 5-clutch intermediate pack for the direct clutch assembly.

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Product Details

This kit gives you the FTI Performance TH400 Promod Direct Drum, complete with a 36-element sprag, a pressure plate, and a 5-clutch intermediate pack. This is a well-built assembly designed for high-performance Turbo 400 transmissions, often used in racing applications where durability and consistent engagement are critical.

The direct drum itself is machined from billet aluminum, which offers a good balance of strength and weight savings. The inclusion of a 36-element sprag is a notable feature, providing a strong and reliable engagement mechanism that can handle significant torque. This sprag design is often preferred in demanding applications because it offers more contact points for improved load distribution and longevity compared to smaller element sprags. The kit also comes with a pressure plate and a five-clutch intermediate pack, giving you the core components needed to rebuild or upgrade the direct clutch assembly in your TH400 transmission.

When installing this kit, pay close attention to the clearances and specifications outlined in your transmission's service manual. Proper setup is key to ensuring the sprag engages correctly and the clutch pack functions as intended under load. This direct drum kit is a solid option for those looking to build a robust TH400 for racing or high-performance street use.