What does your tach read at 60mph? If a 3.7 it should read about 3000 rpm.
If a 4.10 it will read higher. That's considering you have the stock size
tires fit.
I will send you an excel spreadsheet that will calculate rpm based upon diff
ratio and tire size as entered ratios. It also has you enter the gear ratios
but for a TR4 they don't need changed.
If anyone else would like the spreadsheet let me know and I'll send it to
you.
JVV
----- Original Message -----
From: <ZoboHerald@aol.com>
To: <roggez@bigpond.net.au>; <triumphs@autox.team.net>
Sent: Wednesday, November 22, 2006 9:37 PM
Subject: Re: [TR] Differential Identification TR4
> In a message dated 11/22/2006 9:27:40 P.M. Eastern Standard Time,
> roggez@bigpond.net.au writes:
>
> Does anyone know of a simple way to identify what differential (3.7 or
> 4.1) is fitted to a TR4? I have checked all my sources and cannot find
any
> way of differentiating (no pun) between the types using the serial number
on
> the top rear face of the diff.
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