[Spits] Separating spring from Diff

[jimmuller at rcn.com]

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