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This is interesting... As I understand it, the input gear drives the layshaft. Lock the input to the output and you have 1:1 4<sup>th</sup> gear. To make a close ratio box, they could have changed the input-layshaft ratio, in which case the input shafts would
not be interchangeable between the spit and GT6, but the 1-3 gear sets could be. Alternately they could also use the same input-layshaft gearset and then change the three lower ratio gearsets. In the latter case the input shafts could indeed be interchangeable... </div>
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If you look at the 1-3 ratios in Joe's link, the Spit and GT6 ratios do not scale by a fixed factor - indicating it is not simply a change of input-layshaft ratio. This means that the 1-3 gearsets are different, and the input-layshaft could be common. Of course
it's also possible they changed both the layshaft and the 1-3 ratios..</div>
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Thank you,</div>
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Andrew</div>
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<div id="divRplyFwdMsg" dir="ltr"><span style="font-family: Calibri, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);"><b>From:</b> Fot <fot-bounces@autox.team.net> on behalf of Barr, Scott via Fot <fot@autox.team.net><br>
<b>Sent:</b> Thursday, October 12, 2023 10:35 AM<br>
<b>To:</b> JOE CURRY <spitlist@cox.net>; Barr, Scott via Fot <fot@autox.team.net>; Rod Pierce <rpierce141@gmail.com><br>
<b>Subject:</b> Re: [Fot] GT6-Spitfire Transmission Conversion</span>
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<p style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;">And yet it worked fine. Perfectly. Go figure.</p>
<p style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;"> </p>
<p style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;">Scott (B.)</p>
<p style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;"> </p>
<div style="padding: 3pt 0in 0in; border-top: 1pt solid rgb(225, 225, 225);">
<p style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;"><b>From:</b> JOE CURRY <spitlist@cox.net><br>
<b>Sent:</b> Thursday, October 12, 2023 9:33 AM<br>
<b>To:</b> Barr, Scott <sbarr@McCarty-Law.com>; Barr, Scott via Fot <fot@autox.team.net>; Rod Pierce <rpierce141@gmail.com><br>
<b>Subject:</b> Re: [Fot] GT6-Spitfire Transmission Conversion</p>
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<p style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;"> </p>
<p style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;">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" id="OWA0d86b803-bd25-ff79-4fe6-154fa4c6d0e5" class="OWAAutoLink" shash="AR4Y5bYgph9Dsip74/9TkobXNifULdCtd0nhT5zOZcQ4XVcWZZ8AZjTGC9mtGyA1VVwMPZ8r/oG2sMYcM87kqCxAZAs69Yv+YS18RS7q8i/z9tgF/t9CVc2iyUYOM3DiKaoYPP8IlCLbhjKh1DRrfi/oKZ4PJEN+vb1f1xwK4rk=" originalsrc="https://www.geocities.ws/MotorCity/Speedway/1080/gt6boxtospit.html" data-auth="Verified" style="margin-top: 0px; margin-bottom: 0px;">https://www.geocities.ws/MotorCity/Speedway/1080/gt6boxtospit.html</a>.</p>
<p style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;"> </p>
<p style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;">Joe</p>
<blockquote style="margin-top: 5pt; margin-bottom: 5pt;">
<p style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;">On 10/12/2023 9:31 AM EDT Barr, Scott via Fot <<a href="mailto:fot@autox.team.net" id="OWA08b5827b-34b6-1756-6f02-1105b8ca7af9" class="OWAAutoLink" style="margin-top: 0px; margin-bottom: 0px;">fot@autox.team.net</a>>
wrote:</p>
<p style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;"> </p>
<p style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;"> </p>
<p style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;">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>
<p style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;"> </p>
<p style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;">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>
<p style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;"> </p>
<p style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;">Scott (B.)</p>
<p style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;"> </p>
<div style="padding: 3pt 0in 0in; border-top: 1pt solid rgb(225, 225, 225);">
<p style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;"><b>From:</b> Fot <<a href="mailto:fot-bounces@autox.team.net" id="OWA4e1d1880-8bf4-da35-6bb9-acb65e8c1ebe" class="OWAAutoLink" style="margin-top: 0px; margin-bottom: 0px;">fot-bounces@autox.team.net</a>>
<b>On Behalf Of </b>Rod Pierce via Fot<br>
<b>Sent:</b> Thursday, October 12, 2023 7:57 AM<br>
<b>To:</b> Rod Pierce via Fot <<a href="mailto:fot@autox.team.net" id="OWA32dca18e-9eda-cee0-f2ec-b97a62cc3d00" class="OWAAutoLink" style="margin-top: 0px; margin-bottom: 0px;">fot@autox.team.net</a>><br>
<b>Subject:</b> [Fot] GT6-Spitfire Transmission Conversion</p>
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<p style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;"> </p>
<p style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;">I have a GT6 transmission in my spares collection and I have heard they can be converted to run in a Spitfire. </p>
<p style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;"> </p>
<p style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;">I'm interested in accomplishing this over the winter and I am looking for information/advice on the best way to do it.</p>
<p style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;"> </p>
<p style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;">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>
<p style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;"> </p>
<p style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;">Thanks</p>
<p style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;"> </p>
<p style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;"> </p>
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