GT6 gears are very close ratio. The easiest way to fit them is to have the
input shaft modified, but take care the hardening on the gear isn't altered.
Canley Classics do a closer ratio set (from a Marina 1800), which helps with
the gap between 2nd and 3rd but avoids the very high first gear.
John Kipping
----- Original Message -----
From: "Joe Curry" <spitlist@cox.net>
To: <spitfiresuz@141.com>; <fot@autox.team.net>
Sent: Tuesday, June 22, 2004 5:07 AM
Subject: RE: Spitfire transmissions
> Susan,
> Because the later GT6 box and the Later MkIV 3-rail boxes are basically
> the same with the exception of the oversized input shaft and the obvious
> gearing differences, you can transfer the gears to a MkIV box, but it
> would require the same modifications as you would do to the complete GT6
> box.
>
> Therefore, you would need to do the following:
>
> 1. Cut down the input shaft to the same length as the equivalent
> Spitfire length.
>
> 2. Find a clutch disk with a 1" 10 spline hub that will fit the GT6
> shaft and be the right diameter surface to fit your flywheel.
>
> 3. You will have to pick and choose the right length throwout bearing
> actuator to fit your application. Spits came with different length
> pieces through out the years. I seem to recall using one from a Mk1 for
> the conversion I did on Tiny Tim.
>
> Hopefully, you won't have a problem with the shaft rubbing on the center
> of the flywheel as I did. I ended up chamfering the center hole in the
> aluminum flywheel to solve that problem. It sounded like the throwout
> bearing was howling and it took a long time and a lot or removing and
> replacing the gearbox to finally solve that problem.
>
> Joe
>
>
> -----Original Message-----
> From: owner-fot@autox.team.net [mailto:owner-fot@autox.team.net] On
> Behalf Of spitfiresuz@141.com
> Sent: Monday, June 21, 2004 9:41 AM
> To: fot@autox.team.net
> Subject: Spitfire transmissions
>
> Hi all!
>
> Just a question to ask if anyone knows what the competitive Spit racers
> are
> running for transmissions -- we have heard GT6 boxes are the thing, but
> wanted to check.
>
> And what modifications are needed to put a GT6 box in a Spit? We have
> heard anything from just modifying the input shaft to having to adapt
> the
> GT6 gears into the Spit box.
>
> Thank you!
>
> Susan :)
>
>
>
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