Speedtek T56 1st to 4th Heavy Duty Dog Engagement Gearset - 4 Speed Dogbox

SKU: T56DB-COR-29-DR-ISF
Availability: in stock Many in stock Out of stock You can purchase this product but it's out of stock

Speedtek T56 1st to 4th Heavy Duty Dog Engagement Gearset - 4 Speed Dogbox

$8,325.00

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Vendor: Speedtek Auto Racing
Product Type: Drivetrain
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DESCRIPTION

Speedtek T56 1st–4th Dog Engagement Gearset

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
Chevrolet Corvette C5 / C6
Dodge Viper
Dodge Challenger
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.
Two-Piece Countershaft Configuration - The 4-speed variant retains the OEM 5th and 6th gear provisions.
Factory Mainshaft Compatibility - Designed to work with the factory mainshaft, subject to the required modifications and application-specific fitment. (Instructions on modifications required are provided)
Optional 5th–6th Gear Delete Tube – Available for configurations where the original upper gears are not required.
Optional Dog Reverse Gear Assembly – Available for applications requiring reverse gear functionality. (We provide a specific counter shaft which enables you to run our Dog Engagement Reverse Gear Assembly). We provide the 5th & 6th Gear Delete Tube & 4 Speed H Pattern Shifter Gate Mechanism as standard when you option our Reverse Dog Engagement.
Optional 4 Speed H Pattern Shifter Gate - Currently in our manufacturing process, this will delete the 5th & 6th Gate Access.
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

Ratio	Tooth Count
2.01	20 / 11
2.22	22 / 11
2.49	27 / 12
2.68	29 / 12
2.96	32 / 12

2nd Gear

Ratio	Tooth Count
1.73	25 / 16
1.94	28 / 16

3rd Gear

Ratio	Tooth Count
1.28	24 / 19
1.40	21 / 19

4th, 5th & 6th Gear

Gear	Ratio	Configuration
4th	1.00	Direct drive
5th	OEM	Retained OEM provision
6th	OEM	Retained OEM provision

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.

**Mainshaft Compatibility: These transmissions are available with multiple factory mainshaft variations. After completing your purchase, please email us clear photos of your factory mainshaft so our team can identify the correct configuration and supply the components required for your application.

SHIPPING & LEAD TIME

If product Ex-Stock Australia, Product will be sent within 3-5 Business days. If product Not instock AUS, a 3-4 week lead time will apply.

REVIEWS

RETURNS POLICY

We have a 14-day return policy, which means you have 14 days after receiving your item to request a return. To be eligible for a return, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging, we require you to provide us with the receipt or proof of purchase. To start a return, you can contact us at admin@speedtekautoracing.com. If your return is accepted, we’ll send you a return shipping label, as well as instructions on how and where to send your package. The return label paid for by the customer, Items sent back to us without first requesting a return will not be accepted. Please note, a restocking fee of 15% will apply to any returned goods. You can always contact us for any return question at admin@speedtekautoracing.com. Damages and issues: Please inspect your order upon reception and contact us immediately if the item is defective, damaged or if you receive the wrong item, so that we can evaluate the issue and make it right. Exceptions / non-returnable items, Certain types of items cannot be returned, like custom products (such as special orders or personalized items). We also do not accept returns for hazardous materials, flammable liquids, or gases. Please get in touch if you have questions or concerns about your specific item. Unfortunately, we cannot accept returns on sale items (discounted products) or gift cards. Exchanges: The fastest way to ensure you get what you want is to return the item you have, and once the return is accepted, make a separate purchase for the new item. Refunds: We will notify you once we’ve received and inspected your return and let you know if the refund was approved or not. If approved, you’ll be automatically refunded on your original payment method. Please remember it can take some time for your bank or credit card company to process and post the refund too.

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