So it would appear. Oops!
The larger shaft of the GT6 gearbox can be cut down to the right length
and an alternative clutch disk would have to be substituted to fit the
1" diameter of the shaft. And the resulting ratios for the gears would
be:
1st: 2.65:1
2nd 1.78:1
3rd 1.25:1
4th 1.00:1
Reverse 3.1:1
Whereas, the Early Spit has the following gears:
1st: 3.75:1
2nd 2.16:1
3rd 1.39:1
4th 1.00:1
Reverse 3.75:1
Joe
-----Original Message-----
From: ZoboHerald@aol.com [mailto:ZoboHerald@aol.com]
Sent: Sunday, December 21, 2003 3:41 PM
To: spitlist@COX.NET; pelevesq@globetrotter.net;
spitfires@autox.team.net
Subject: Re: Transmission
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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