Then you have to get the shifter to appear in the right location. In addition to simply finding the space for the new transmission, you have to figure out how to mate it to your engine, clutch and driveshaft. Swapping a five-speed into an old TR is rather tough. They’ve used everything from Ford T-5s to units from Ford Sierras, Nissans and Toyotas, but these swaps have had varying levels of success. Through the years, enthusiasts have figured out how to install any number of five-speed transmissions into a Triumph TR. This overdrive unit can be made to work, but it’s also heavy, expensive to restore, and a bit cantankerous to maintain. Finding one that isn’t worn out is rarer still. Sure, a Laycock de Normanville overdrive unit was a factory option when these cars were new, but it was rare then and is even rarer today. Our 1969 Triumph TR6 would definitely benefit from that extra cog. The four-speed box is nice, but the car really needs an overdrive or fifth gear to purr instead of howl at highway speeds. However, even a well-sorted TR6 has a few weak spots, and the transmission is one of them. In the world of ’60s British roadsters, the Triumph TR is a standout. Want to make sure you're reading all the latest stories? Subscribe now. This story ran in an old issue of Classic Motorsports.
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