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|After a great deal of research on other options, I have come to the conclusion that there is no easy way of keeping a Getrag box in my GT while having a proper overdrive 5th gear. So I have decided to install a Toyota W58 box out of a Lotus Excel, in parallel with upgrading the engine to 907/912HC hybrid. I'll retain the original 3.45:1 axle.
This raises a further question about the speedo cable. For those of you who have installed the W58 box, did you need a new cable with a different coupling at the gearbox end, and/or to recalibrate the Smiths speedo?