Subject: [Fot] Spit or GT6 diff ratio?

From: James Palmer via Fot <[email-masked]>
Date: Mon, 24 Nov 2025 12:10:36 -0500

I have what looks like a Stanpart ring and pinion for a “small” Triumph.  In a StanPart box, but the part number is illegible.  By my count,  the pinion gear has eight teeth and the ring gear has 39 teeth.  4.875:1?   What Triumph used that ratio?

Jamie Palmer
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From: Mike Harmuth via Fot <[email-masked]>
Date: Mon, 24 Nov 2025 15:34:22 -0500

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>From TriumphSpitfire.com reference section
(Thanks to Shawn Frank)

4.875:1948cc Herald Saloon (G case #) (not interchangeable with 4:55:1)

On Mon, Nov 24, 2025 at 1:34=E2=80=AFPM James Palmer via Fot <[email-masked]=
m.net>
wrote:

> I have what looks like a Stanpart ring and pinion for a =E2=80=9Csmall=E2=
=80=9D Triumph.
> In a StanPart box, but the part number is illegible.  By my count,  the
> pinion gear has eight teeth and the ring gear has 39 teeth.  4.875:1?
>  What Triumph used that ratio?
>
> Jamie Palmer
> Unsubscribe/Manage <http://www.team.net/pipermail/fotUnsubscribe/Manage>:
> http://autox.team.net/mailman/options/fot/[email-masked]
>
>
>

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<div dir=3D"ltr">From TriumphSpitfire.com reference section<div>(Thanks to =
Shawn Frank)<br><div><br></div><div><span style=3D"color:rgb(0,0,0);font-fa=
mily:Georgia,serif;font-size:17px">4.875:1</span><img src=3D"http://www.tri=
umphspitfire.com/images/whitedot.gif" width=3D"5" height=3D"5" style=3D"box=
-sizing: inherit; border-style: none; display: inline-block; height: auto; =
max-width: 100%; color: rgb(0, 0, 0); font-family: Georgia, serif; font-siz=
e: 17px;"><span style=3D"color:rgb(0,0,0);font-family:Georgia,serif;font-si=
ze:17px">948cc Herald Saloon (G case #) (not interchangeable with 4:55:1)</=
span></div></div></div><br><div class=3D"gmail_quote gmail_quote_container"=
><div dir=3D"ltr" class=3D"gmail_attr">On Mon, Nov 24, 2025 at 1:34=E2=80=
=AFPM James Palmer via Fot &lt;<a href=3D"mailto:[email-masked]">fot@au=
tox.team.net</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" styl=
e=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);paddin=
g-left:1ex">I have what looks like a Stanpart ring and pinion for a =E2=80=
=9Csmall=E2=80=9D Triumph.=C2=A0 In a StanPart box, but the part number is =
illegible.=C2=A0 By my count,=C2=A0 the pinion gear has eight teeth and the=
 ring gear has 39 teeth.=C2=A0 4.875:1?=C2=A0 =C2=A0What Triumph used that =
ratio?<br>
<br>
Jamie Palmer<br>
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<br>
</blockquote></div>

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From: Mark Bradakis via Fot <[email-masked]>
Date: Mon, 24 Nov 2025 14:11:29 -0700

> I have what looks like a Stanpart ring and pinion for a “small” Triumph.  In a StanPart box, but the part number is illegible.  By my count,  the pinion gear has eight teeth and the ring gear has 3…

I believe that is for an early Herald, don't recall what years though.

mjb.