Speedtek T56 1st–4th Dog Engagement Gearset with Heavy Duty 31 Spline Mainshaft

Heavy-Duty Motorsport Transmission Gearset | Customisable Wide-Ratio & Close-Ratio Configurations

The Speedtek T56 1st–4th Dog Engagement Gearset is engineered for high-performance and competition applications where strength, reliability and gear ratio flexibility are essential.

Designed around a heavy-duty helical-cut gear configuration, this gearset allows you to fine-tune your transmission to suit your vehicle, engine characteristics and intended application. With multiple first, second and third gear ratio options available, you can configure your transmission for either a wide-ratio or close-ratio setup to suit your requirements.

Key Features

• 4-Speed Dog Engagement Gearset - Purpose-built for demanding motorsport applications.

• Input Shaft Options - Standard 26-spline configuration, with an optional 29-spline input shaft.

• Multiple Input Shaft Applications - Available for a range of popular engine and vehicle platforms.

Available Input Shaft Applications

• GM / Holden GTO and SS Commodore

• Cadillac CTS-V

• Ford Barra 4.0L

• Ford Mustang

• Other applications available upon request. Additional costs may apply.

Design & Performance Features

• Individually Removable Gears - Simplifies servicing, maintenance and component replacement.

• Heavy-Duty Helical-Cut Gear Design - Engineered with KissSoft for demanding competition use.

• 42mm wide Input Shaft Drive and Driven Gears - Heavy-duty gear architecture designed for increased durability.

• 7mm Thick Dog Rings - Built to withstand the demands of repeated dog engagement under competition conditions.

• Heavy-Duty Chromoly Shift Forks - Designed for reliable gear selection under load.

• 18-Spline Hub Design - Purpose-built for the gearset's engagement system.

• Heavy Duty Mainshaft - 31 Spline Heavy Duty Proprietary Speedtek Mainshaft

• 5th–6th Gear Delete Tube – Removes 5th & 6th Gears entirely.

• 4 Speed H Pattern Shifter Gate Mechanism - This is provided as standard in this Heavy Duty Kit.
  
  

• Dog Reverse Gear Assembly- The reverse gear assembly is supplied as standard and includes all necessary components to convert your factory reverse gear to a dog engagement configuration.

• Optional Isotropic Superfinishing – Precision-polished gear surfaces designed to reduce friction, minimise operating noise, improve wear resistance and extend gear life, while helping manage operating temperatures and improve overall transmission efficiency.

Gear Ratio Options

The Speedtek T56 gearset offers multiple ratio combinations, allowing you to tailor the transmission to your engine's powerband, tyre diameter, final-drive ratio and intended use.

Gear tooth counts are listed as main gear / counter gear.

1st Gear – Multiple Options

2nd Gear

3rd Gear

4th, 5th & 6th Gear

Reverse: OEM configuration, with an optional reverse gear dog engagement assembly available.

Final gear combinations and compatibility are subject to the selected gearset configuration and application requirements.

Optional Upgrades

Further customise your transmission with the following Speedtek upgrades:

• Race-Spec Short Shifter – For a more direct and precise gear-selection experience. (Made to order, 3-6 month lead time)

• Billet Front Transmission Plate – Compatible with the Tilton 8000 Series hydraulic release bearing.(Made to order, 3-6 month lead time)

• Oil Spray Bar – Optional targeted oil delivery for the 1st–4th gearset to support lubrication requirements in demanding applications. (In Stock)

Engineered for Competition

The Speedtek T56 1st–4th Dog Engagement Gearset combines a heavy-duty gear design with configurable ratios and application-specific options, giving builders and race teams greater flexibility when developing a competition transmission.