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Since the GT6 gearbox has a different gearset than the Spitfire has, I can't see how that would work. The first gear for the 3-rail Spitfire has a ratio of 3.75 compared to 2.65 for the GT6, therefore the input shaft gear won't mesh with the gears in the GT6 box. Here is a link to the summary of what I did way back in 2000 when I adapted a Mk3 GT6 gearbox to work with a small journal 1296 that I used in my autocross prepared Mk1 Spit: <a href="https://www.geocities.ws/MotorCity/Speedway/1080/gt6boxtospit.html">https://www.geocities.ws/MotorCity/Speedway/1080/gt6boxtospit.html</a>.
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Joe
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On 10/12/2023 9:31 AM EDT Barr, Scott via Fot <fot@autox.team.net> wrote:
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<p class="MsoNormal">When I had this done some years ago, I took the job to a local racer-transmission guy. After fiddling with it a bit, he just put the Spitfire input shaft into the GT6 trans and it worked fine. GT6 gearbox for my Spit racer, no cutting, welding, etc. required. It worked great for a few seasons until I pulled it to install an overdrive trans.</p>
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<p class="MsoNormal">Could just be luck? I understand that there are a number of variations of gear constructions and maybe I just happened to bring him two that matched? Who knows. But it worked for me.</p>
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<p class="MsoNormal">Scott (B.)</p>
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<p class="MsoNormal"><strong>From:</strong> Fot <fot-bounces@autox.team.net> <strong>On Behalf Of </strong>Rod Pierce via Fot<br><strong>Sent:</strong> Thursday, October 12, 2023 7:57 AM<br><strong>To:</strong> Rod Pierce via Fot <fot@autox.team.net><br><strong>Subject:</strong> [Fot] GT6-Spitfire Transmission Conversion</p>
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<p class="MsoNormal">I have a GT6 transmission in my spares collection and I have heard they can be converted to run in a Spitfire. </p>
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<p class="MsoNormal">I'm interested in accomplishing this over the winter and I am looking for information/advice on the best way to do it.</p>
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<p class="MsoNormal">It is my understanding that you can have the GT6 input shaft either machined to fit or you can cut the input shafts from a GT6 and a Spitfire and weld the Spitfire on the GT6 transmission.</p>
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<p class="MsoNormal">Thanks</p>
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