I should clarify that you would need the differential cage as well to bolt
in. Joe is right that the crown wheel from the early cars needs to bolt to
a carrier from an early car, but the assembly can be placed into any
housing.
aaron
>From: "Joe Curry" <spitlist@COX.NET>
>To: "'Aaron Johnson'" <fpspitfire37@msn.com>
>Subject: RE: changing spitfire gear sets
>Date: Wed, 3 Sep 2003 16:45:46 -0700
>
>WRONG! The early Spit rears had smaller gears and output shafts.
>Therefore they will not work. All GT6, MkIV and 1500 gears with the
>exception of the 3.27 are interchangeable.
>
>Joe
>
>-----Original Message-----
>From: owner-fot@autox.team.net [mailto:owner-fot@autox.team.net] On
>Behalf Of Aaron Johnson
>Sent: Wednesday, September 03, 2003 1:23 PM
>To: rocky@tri.net; zhbmacaw@worldnet.att.net; fot@autox.team.net
>Subject: Re: changing spitfire gear sets
>
>Tom,
>
>All the information I have is that any crown wheel and pinion should fit
>any
>model of differential regardless of what it came from...even
>GT6/Herald/Vitesse and Atlas Vans, so strange things are afoot at the
>circle
>K.
>
>4.11 is standard fair for my car but next year may require a move back
>to a
>3.89 when more horsepower and rpm becomes available. I would agree that
>the
>4.55 is not really ideal for a 1300 or 1500 and I don't think too many
>people are using 4.55's in SCCA right now with 1147's.
>
>Aaron Johnson
>#38 F-Prod Spit MKIV Oregon Region SCCA
>http://www.geocities.com/spitracer9
>
>
> >From: "Rocky Entriken" <rocky@tri.net>
> >Reply-To: "Rocky Entriken" <rocky@tri.net>
> >To: "Tom Britt" <zhbmacaw@worldnet.att.net>, <fot@autox.team.net>
> >Subject: Re: changing spitfire gear sets
> >Date: Wed, 3 Sep 2003 14:15:09 -0500
> >
> >I'm curious, Tom, what track are you racing at that the 4:55 is too
>low?
> >
> >I race MiDiv (Heartland Park, Hallett, Mid-America, Gateway, Memphis)
>and
> >run a 4:55. The only place it seems to hurt is the Memphis straightaway
>
> >(the
> >full end-to-end dragstrip), but then I'm glad to have it for the run
>down
> >the backside through the M's, etc.
> >
> >(I also autocross, so good for that too).
> >
> >Back when Mid-America Raceway (St. Louis, not Omaha) was in use, my
>brother
> >raced my car and used the 4:55 there even though it, too, ran the
>straight
> >the full length of the dragstrip and runout, because he gained more
>between
> >1 and 10 than he lost between 10 and 1. When we ran at Hutchinson, an
> >airport circuit, that was the only track the 4:11 paid dividends.
> >
> >Also, in what way does your intended replacement not match up? Do the
>bolt
> >holes not match, or does it not fit in the case, or what?
> >
> >BTW -- '63 would be a Mk. I, not Mk. III. Mine's a '64 Mk. I. I'm not
>sure
> >of the specs, but seems I recall the diff case got bigger in later
>models,
> >or maybe that involved using a GT6 rear. Call Ted Schumacher at TS
>Imports
> >and pick his brain. 800-543-6648. He's answered similar questions for
>me in
> >the past.
> >
> >--Rocky Entriken
> >
> >----- Original Message -----
> >From: "Tom Britt" <zhbmacaw@worldnet.att.net>
> >To: <fot@autox.team.net>
> >Sent: Wednesday, September 03, 2003 12:21 PM
> >Subject: changing spitfire gear sets
> >
> >
> > > Friends:
> > >
> > > I am attempting to change my 73 spitfire, rear end gear ratio
>from
> >the
> > > stock 3:89 to a 4:11. I have a 4:11 ring and pinion from a 63 mark
>III,
> >was
> > > told it would match up, but it doesn't. I am a low budget vintage
>racer
> >and
> > > looking for advice to solve this problem.
> > > Any help would be greatly appreciated.
> > > I also have a 4:55 ring and pinion, to low a gear for our track,
> >probably
> >good
> > > for autocrossers, if anyone interested.
> > >
> > > Tom Britt
> > > Spitfire racer
>
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