Bill,
If the tranny is the later GT6 type, the parts are pretty much interchangeable
with the full synchro 3-rail Spit (circa MkIV) tranny.
That goes for the mainshaft too.
The GT6 tranny would have to be modified to work in the spit. See the Spitfire
tips archive for a blurb I wrote up for last month's
Spitfire Database Tip section.
(http://www.geocities.com/MotorCity/Speedway/1080/spitfaqs.html)
You will also have to obtain a different clutch disk to mate with the larger
GT6 splines. Ted Schumacher can provide that.
I am going to be using this box (without OD) in my Spit Race car with a
modified 1296 (1351 cc) engine. The diff is a 4.11 and I don't
think there will be any problems with this combination. For the Spit, you will
want to stay with a pretty low geared differential,
particularly with the OD counteracting the high revs on the top end.
Sounds like a good fit to me. Let me know it you go through with it.
Joe
SJagGo@aol.com wrote:
>
> Greetings all:
> As some of you may know, I purchased a professionally rebuilt GT6 OD gearbox
> (d-type) thinking it was a Spit box. I have plenty of spare tranny parts and
> could replace the input shaft and bell housing without any problem.
> Has anyone used this setup with an 1147 engine? What type of rearend worked
> best? 4.11? 3.89? Did first gear suffer significantly? I wouldn't have a
> problem swapping all the flanges, etc., either.
>
> Another question: Will the mainshaft of a GT6+ OD tranny fit the 3-rail 71-74
> spitfire all-synchromesh gearbox? (I think it will). I could also rebuild
> one of these trannys using the OD parts from GT6+, and using the Spit
> mainshaft to complete a regular GT6 box and them sell it.
> What should I ask for a GT6 box with new layshaft, bearings, 3-4 hub gear,
> 1st gear, synchros, and seals? How much if I left the OD in place?
>
> Thanks,
> Bill B
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