When you're cruising on the freeway in your Triumph, wouldn't you like the engine to be "purring" at 2500 RPM instead of "howling" at 3400 RPM?

Contact HDVA directly for final pricing and to order these products. Prices subject to change.

Effective January 1, 2014
Due to escalating materials costs, HVDA will no longer offer free insured shipping within the continental U.S and Canada. Customer will pay for actual insured shipping within U.S., Canada only. Orders received outside of the U.S. and Canada will pay actual shipping charges as usual. HVDA will not charge a handling or packaging fee. California customers are subject to State sales tax.



Gear Ratios Conversion Table

Additional Photos

assembled kit

The conversion installed in a Triumph chassis

transmission assemble

Transmission Chassy

Transmission Chassy - Front view

Transmission Conversion Kit

Price: $1900 | Order

Many Triumphs were built before freeway driving was common; so overdrive transmissions were rare. Today, you spend a lot of time on the freeway and without overdrive, your engine works a lot harder to keep up with traffic. What can you do?

You could install an original Triumph overdrive transmission - if you can find a usable one for a reasonable price; or you could install a fully synchronized, reliable, Toyota 5-speed transmission, and reduce your top-end cruising revs by as much as 22 percent.

HVDA offers conversion kits to fit all TR-2 through TR-6 series engines with Toyota 1982-85 Celica or Supra, 1984-96 pickup truck 5-speed, or 1992-97 Lexus SC300 5-speed manual transmissions. No cutting, drilling, or welding is required, and the car will still look "original" when you're done. You even keep the original Triumph shift lever and the original driveshaft, without modification! It weighs 50 pounds less than the Triumph transmission with an A-type overdrive, and they don't leak. (The 4-cylinder engines need the pressure plate changed to a TR-6 pressure plate.)

If you know how to remove and install a transmission and clutch, you're qualified to do this job. The conversion is straightforward, and can be done by any experienced mechanic.

Content of Conversion Kit

The HVDA Triumph Transmission Conversion Kit contains everything* you need to make the conversion.

- a new bell housing that adapts the Toyota transmission to your engine

- a gear shift lever adapter mechanism and housing

- a new speedometer cable and mounting bracket

- a new transmission output flange/slip yoke and a locking collar for the driveshaft

- new transmission mounts and brackets for your model of Triumph**

- a new clutch disk and alignment tool

- a new pilot bushing and sleeve

- a new hydraulic clutch release throw out bearing with steel braided hoses

* No special tools are required, but you need to supply your own set of metric wrenches and sockets, in addition to a standard SAE set. A hydraulic transmission jack is also recommended.

**TR2s through non-IRS TR4As require one kind of mount and IRS TR4s through TR6s require another.

Accessories and Replacement Parts