[Alpines] rear axle question

[jacranwell at aol.com]

As many cars have had the diff replaced, the only way to check is as follows.


Jack up one rear wheel. Mark the top of the tyre and the side of the prop with
paint or tape. Turn the wheel through 10 revolutions, at the same time have a
mate count the number or revs for the prop.


Then calculate the diff ratio. I think the ratio is doubled, as only one wheel
is turning, so a 4.22 diff should give a ratio of 8.44., and 3.89 a ratio of
7.78, etc.


Julian
SIII, awaiting O/D, when I get around to it.



-----Original Message-----
From: Allan Ballard <aballard at ix.netcom.com>
To: Bill Mounce <bmounce at rcn.com>
CC: Alpine List <alpines at autox.team.net>
Sent: Mon, 23 Dec 2013 14:44
Subject: Re: [Alpines] rear axle question


Ill offer the following for starters:

Differentials:

Series 1, 2, 4, 5:
standard 3.89 (4.22 with Overdrive)

Series 3:
3.89 for both standard and overdrive

(SAOCA web site source)

I think the 3.70 differentials are from later Alpines and are being
retrofitted to series Alpines...

Allan Ballard
Series 1 project
Series IV driver (overdrive added)




On Dec 23, 2013, at 9:27 AM, Bill Mounce <bmounce at rcn.com> wrote:

> Hello all,
>
>
>
> I just read the article in this month's Rootes Review about adding and O/D
> unit, and they listed two different rear axle ratios, and the resultant
> speeds v. revs.  I always had these questions: how do I know which rear end
> I have, and why were there two different ones?  At one point I thought one
> went with the O/D trans, the other with non O/D, but that made little
sense.
> Can anyone 'splain'?
>
>
>
> Thanks, Merry Christmas & Happy Holidays to all,
>
>
>
> Bill Mounce
>
>
>
> 1967 SV
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