[Fot] GT6-Spitfire Transmission Conversion

[JOE CURRY]

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:  https://www.geocities.ws/MotorCity/Speedway/1080/gt6boxtospit.html.
 
Joe

> On 10/12/2023 9:31 AM EDT Barr, Scott via Fot <fot at autox.team.net> wrote:
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> 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.
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> 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.
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> Scott (B.)
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> From: Fot <fot-bounces at autox.team.net> On Behalf Of Rod Pierce via Fot
> Sent: Thursday, October 12, 2023 7:57 AM
> To: Rod Pierce via Fot <fot at autox.team.net>
> Subject: [Fot] GT6-Spitfire Transmission Conversion
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> I have a GT6 transmission in my spares collection and I have heard they can be converted to run in a Spitfire.  
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> I'm interested in accomplishing this over the winter and I am looking for information/advice on the best way to do it.
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> 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.
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> Thanks
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