Joe, read the original message again. The second gearbox is a "KC" gearbox.
If unaltered on the inside, etc., that means it's a GT6 gearbox, and in most
cases the ratios simply aren't suitable for the four-cylinder engines. Oh, and
then there's the different input shaft, and (if present) different
bellhousing/clutch throwout arm/slave cylinder issues, etc., etc., not to
mention changing
the output flange, etc., etc.
As fare as the differences between 3- and 4-synchro Spitfire gearboxes, yes,
the 4-synchro is a bit longer. But in most cases, the Spitfire's sliding
spline driveshaft can compensate for the 5/8" difference in length...once that
driveshaft's input flange is changed to one that will bolt up to the larger
flange
on the later gearbox.
--Andy Mace
In a message dated 12/21/2003 5:15:46 PM Eastern Standard Time,
spitlist@COX.NET writes:
> Paul,
> Yes, you can use the full synchro gearbox but you will have to shorten
> the driveshaft (or use one specifically made for that gearbox. When the
> synchro for first gear was added, the gearbox was lengthened slightly.
>
> The ratios are the same except for fitst gear. The early boxes has a
> first ratio of 3.75:1 but was changed to 3.5:1 in later full synchro
> boxes.
>
> Regards,
> Joe Curry
>
> -----Original Message-----
> From: spitfires-owner@autox.team.net
> [mailto:spitfires-owner@autox.team.net] On Behalf Of Paul-Ernest
> Levesque
> Sent: Sunday, December 21, 2003 2:08 PM
> To: spitfires@autox.team.net
> Subject: Transmission
>
> Hello
> I am restoring a 1970 Spitfire MK 3 and have on hand two trasmissions
> the
> one on the car now is number FD 00715 non syncro on first gear, and the
> other on is KC25819
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