Hi All,
Guess I should mention, this GT6 does have an overdrive gearbox...maybe it
won't make a bit of difference then?
Todd
--- On Fri, 3/27/09, jimmuller@rcn.com <jimmuller@rcn.com> wrote:
> From: jimmuller@rcn.com <jimmuller@rcn.com>
> Subject: Re: [Spits] Separating spring from Diff
> To: Spitfires@autox.team.net
> Date: Friday, March 27, 2009, 5:50 PM
> Scott wrote:
> > The GT6 will have had a 3:27 ratio, the Spit will
> likely be
> > a 3.89, so if you swap diffs, the engine will be
> revving
> > quite a bit higher at highway speeds (about 20%
> faster).
>
> All true enough. As a complication, IIRC, "they" put
> a 3.89 into those GT6's which got the OD gearbox and which
> were destined for North America. The rest of the
> world, or at least the home market, got the 3.27 diff, OD or
> not. So if Todd wants to dig up an OD gearbox he'd end
> up with the same highway revs and lower non-OD geaaring,
> which was the factory's intent fo "us".
>
> On the other hand, that's a big switch over and more
> expensive. If I was going through that much trouble
> and expense I'd rather have the home market's higher
> gearing. The GT6 doesn't need lower gearing but lower
> revs on the highway would be nice. In any case, the
> Spitfire diff is moving in the wrong direction. Not
> that the car will prefer to go backwards or anything.
>
> > I don't think you can swap the guts from the Spit into
> the
> > GT6 diff case as the early crownwheel carrier won't
> fit the
> > late model nosecase.
>
> Are the pumpkins interchangeable? Meaning, could he
> put the GT6 rear case with its 6 stud holes onto the
> Spitfire nose and guts? I would've thought so, but it
> one of the zillion of so things I've never tried to
> do. Of course, it would still end up with the 3.89:1
> gearing.
>
> Jim Muller
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