Yes, that J.K. Jackson, eminently successful racer of TR-6s in the Southeast US, patron saint of the Temple of Triumph. He's a noted Triumph engine builder, and a guru for TR gearboxes and Laycock overdrives, especially the A type (his preference for racing is the late A type, which has the biggest hydraulic valves). He doesn't know much about the D type overdrive used on Spitfires and early GT6s, though. - Chris Kantarjiev

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