Shop Talk: Triumph TR6 Transmission Conversion

Written by on February 7, 2011 in Shop Talk, Triumph, Upgrades with 10 Comments

Triumph TR6 Transmission Conversion

Triumph TR6 ready for a new transmission.


We just completed this Toyota 5-speed transmission conversion for a client on his 1971 Triumph TR6. The kit we used was supplied by Herman van den Akker of HVDA Transmission Conversions. Herman has done an excellent job of putting these kits together and the installation was very straight forward.

Triumph TR6 Transmission Conversion

Triumph TR6 Transmission Conversion Installation


We are usually not big fans of doing 5-speed conversions but as overdrive transmissions are getting harder to find, and prices are going up and up on the transmissions and parts, this may be the best route to go in the future. When Herman’s kit is installed, you visually can’t tell that the car has been updated with a 5-speed.

Triumph TR6 Transmission Conversion

Triumph TR6 Transmission Conversion Completed


The transmission mounts in the original tunnel with plenty of room to spare and the shifter is placed in the same location as the original. On the road, the Toyota transmission is nice and quiet and it is sure great to be able to put it in 5th gear and watch those rpm’s drop. Please feel free to post any comments or questions you have.

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  1. Really, nice work done for converting the transmission for Toyota. Nice reference for others.

  2. Jon Gosnell says:

    I have 72 TR6 with the Toyota conversion, The differential ratio is same as a non overdrive TR6. I have had to go to taller tires in order to notice any lower RPMS in 5th gear. I love the smooth shifting of the 5 speed, but I don’t see much other advantage. The TR6 with overdrive gives lower RPM in 4th overdrive. I would much rather have a TR6 4 speed with overdrive.

  3. tom says:

    did you remove the engine or go in through the interior of the car? The pictures suggest the later. What would you do different if you did it again? Was the transmission the only thing missing from the HVDA kit?
    Best-Tom

  4. tom says:

    also-what SPECIFIC Celica transmission did you wind up using and was it easy to find?

  5. Kim Thornsburg says:

    I did the HVDA conversion myself three years ago. I have over 10,000 on the transmission and have never had any problems. Fourth has a higher rpm than my non-overdrive trans, but I am most pleased with my highway mileage in 5th. Also, plenty of passing power in 5th. I used same axle and no leakage. I installed without removing my engine and left exhaust pipes in place. I am not a mechanic. I am not sure what year my Celica transmission is but I think it is an ’85 with 80,000 on it when I put it in my car (picked the year Herman recommended). Everything fit perfectly. I use larger tires also. I have read quite a bit about A/J versus Toyota mileage. I can say that with my SU conversion, my mileage is higher than any A/J I have come across on the net.

  6. Hey there! I know this is sort of off-topic but I had to ask. Does running a well-established website such as yours take a lot of work? I’m brand new to running a blog but I do write in my diary on a daily basis. I’d like to start a blog so I will be able to share my own experience and feelings online. Please let me know if you have any suggestions or tips for brand new aspiring blog owners. Thankyou!

  7. kenneth Ballantine says:

    have a 71′ TR6 and some issues with transmission and clutch , when I do the clutch was thinking of putting 5speed in and read your blog on the supra conversion, any info would be greatly appreciated…..Ken

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