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RE: Rear Gear Tooth Count 4 Ratio?

To: "'mgs@autox.team.net'" <mgs@Autox.Team.Net>
Subject: RE: Rear Gear Tooth Count 4 Ratio?
From: "Unger, Larry G" <larry.g.unger@lmco.com>
Date: Sun, 03 May 1998 19:03:57 -0400
Larry Unger wrote:

>> 4.55:1  41 ring gear teeth/ 9 pinion    competition
>> 4.30:1  43 ring gear teeth/10 pinion    1500/1600 'A'
>> 4.10:1  41 ring gear teeth/10 pinion    1622 'A'
>> 3.91:1  43 ring gear teeth/11 pinion    'B'
>> 3.70:1  41 ring gear teeth/11 pinion    'C'

Bill Schooler replied:

> I thought the 3.7 rear end had 37 and 10 teeth, respectively.
>  Have to go look in my parts book, but I think that's what I
> remember.  Ah Ha!  Right below my feet was my Special Tuning
> Booklet wherein it shows a 3.7 as having 37/10 teeth.

No that you mention it Bill, I'm sure that your right ... I
extrapolated the 3.7:1 ratio by combining the various ring and
pinion gears that I knew were available for the 'banjo axle' ...
never really looked at the specs for the 'C' 'tube axle' ...
just *ass*u*me*d thats how they derived the ratio.  Nice catch
... see corrected info below.

Banjo Axle

3.91:1  11/43  'B' stock, 'A' competition
4.10:1  10/41  MkII 'A' stock, 'A'&'B' competition
4.30:1  10/43  1500/1600 'A' stock, 'A'&'B' competition
4.55:1   9/41  'A'&'B' competition 
4.87:1   8/39  'Twinkie' competition
5.12:1   8/41  'Twinkie' competition

Tube Axle

3.07:1  14/43  'B'&'C' competition
3.31:1  13/43  'B'&'C' competition
3.58:1  12/43  'C' competition
3.70:1  10/37  'C' Stock, 'B' Competition
3.91:1  11/43  'B' Stock, 'C' Competition
4.10:1  10/41  'B'&'C' competition
4.22:1   9/38  'B'&'C' competition
4.55:1   9/41  'B'&'C' competition
4.87:1   8/39  'C' competition

Safety Fast! ... larry.g.unger@lmco.com
'61 MGA 1600 MkII


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