That'll be a nice ratio if you want to go autocrossing, commonly called a
4.88. Not so much for highway driving. For racing it depends on the track
(a "busy" low-speed track yes, Road America no)
With that many teeth (because they are thinner, less beefy), If you're
driving in competition I recommend you have the gears shot-peened first. It
strengthens the metal. I speak as one who's gone through several 4.55
gearsets, then a friend who does that kind of work told me about it and I
had it done to my current one (the last spare I had).
--Rocky Entriken
----- Original Message -----
From: "Robert MacKenzie" <list@mackenzie.aero>
To: "'Barr, Scott'" <sbarr@McCarty-Law.com>; "''Friends of Triumph'Triumph'"
<fot@autox.team.net>
Sent: Monday, September 30, 2013 9:17 AM
Subject: Re: [Fot] 4.875:1 diff ratio?
> That is a Herlad 948 diff you have there.
>
> Robert
>
> -----Original Message-----
> From: fot-bounces@autox.team.net [mailto:fot-bounces@autox.team.net] On
> Behalf Of Barr, Scott
> Sent: Saturday, September 28, 2013 12:16 PM
> To: 'Friends of Triumph' Triumph
> Subject: [Fot] 4.875:1 diff ratio?
>
> We are looking at a Spitfire/GT6 differential which has a 39-tooth ring
> gear
> and an 8-tooth pinion gear. If my math is correct, that is a 4.875
> ratio.
> Is that possible?
>
> If so, has anyone ever used such a beast?
>
> Scott B.
>
>
>
> Scott Barr
> McCarty Law LLP
> (920) 257-2233
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