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?
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, or 1984-96 pickup truck 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.
