There are three basic Triumph diffs - parts are not interchangeable between
these groups. Small pinion bearing type - Standard 8/10, Spitfire I/II/III,
Vitesse 6 and Herald. Large pinion bearing type, very similiar to previous -
Vitesse 2 litre, GT6, Spit IV/1500, Toledo, Dolomites (except Sprint) and
Marina. Largest type - TR, 2000/2500, Sprint (and Stag very similar). Can't
remember about the Atlas any more.
John Kipping
----- Original Message -----
From: "Aaron Johnson" <fpspitfire37@msn.com>
To: <rocky@tri.net>; <zhbmacaw@worldnet.att.net>; <fot@autox.team.net>
Sent: Thursday, September 04, 2003 8:22 AM
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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