12/43 rear axle - Alfa Romeo Bulletin Board & Forums
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post #1 of 19 (permalink) Old 02-18-2010, 03:04 PM Thread Starter
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12/43 rear axle

A dutch gtam builder has discovered his 12/43 rear axle.
But here in Holland doesn't anybody knows what this axle is and where from.
Somebody here knows what this axle is and where it belongs?
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post #2 of 19 (permalink) Old 02-18-2010, 03:36 PM
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12/43 rear axle

Quote:
Originally Posted by giuliabc View Post
A dutch gtam builder has discovered his 12/43 rear axle.
But here in Holland doesn't anybody knows what this axle is and where from.
Somebody here knows what this axle is and where it belongs?
Hello giuliabc,

You say that a Dutch GTAm-builder discovered that his rear axle is a 12/43?

The following final drives were mentioned in the various parts catalogues and the Alfa Romeo Options Performance Catalogue:

6/41 - 7/41 - 7/43 - 8/41 - 8/43 - 9/41 - 9/43 - 10/41 - 10/43 - 11/41 - 11/43

I couldn't find a 12/43 but maybe it is in a 2000 Berlina/GTV/Spider catalogue? Or it is an option for racing? Anyone?

Ciao, Olaf

Olaf Roeten a.k.a. Zagato_Olaf, Bussum, The Netherlands
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post #3 of 19 (permalink) Old 02-18-2010, 03:42 PM Thread Starter
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Wink

Yes and it is ingraved as well 12/43 and counted several times
We can't find it what it is and where from.
On the dutch forum they said it was from a gta sa but it seems it doesn't have a limited slip diff so that sounds a little strange.
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post #4 of 19 (permalink) Old 02-18-2010, 05:06 PM
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Quote:
Originally Posted by giuliabc View Post
On the dutch forum they said it was from a gta sa but it seems it doesn't have a limited slip diff so that sounds a little strange.
ahum, it was me who thinks it's from a GTA SA...

Be aware that we are talking about the crown wheel and pinion. The limited slip diff is mechanicaly a separate unit. If the rear axle has this unit whether or not, depends perhaps more from the history of the axle...

Second remark, the axle came from a non-original (2L engine, ...) GT 1300 Junior.
The owner is building a GTAm Replica...

Quote:
Originally Posted by Zagato_Olaf View Post
The following final drives were mentioned in the various parts catalogues and the Alfa Romeo Options Performance Catalogue:

6/41 - 7/41 - 7/43 - 8/41 - 8/43 - 9/41 - 9/43 - 10/41 - 10/43 - 11/41 - 11/43

I couldn't find a 12/43 but maybe it is in a 2000 Berlina/GTV/Spider catalogue? Or it is an option for racing? Anyone?

Ciao, Olaf
Well Olaf, those ratio's are also mentioned on the FIA Homologation documents for the GTA (and GTAm) to allow them to race in Group 2. The ratio's you wanted to use, had to come from the production cars (or had to be at least available as an option).

The GTA SA raced according FIA Group 5 rules: gear and diff ratio's were totally free! (They only had to fit in the original housings).

According Tabucchi's book on the GTA, a GTAm gathered a maximum speed of about 230 km/h on the Monza track using a 11/43 (=1:3.73) ratio in the diff. Using 9' x 13' rims, no info about the tyres ...
Engine speed: about 7800 rotations/min.

My guess is that they produced a 12/43 (=1:3.58) for :
  • Experimental reasons
  • To be used on the GTA SA (a bit more horsepower at about 7500 rot/min, say 300 rot/min less then the GTAm)

According to Pignacca/NADA, the GTA SA used 5,5M x 14 'tyres' (?) ...

Last edited by Koenraad; 02-18-2010 at 05:08 PM. Reason: Spell check ;-)
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post #5 of 19 (permalink) Old 02-19-2010, 12:18 AM
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12-43 was 105 Berlina 2000 Automatic version.

Regards

Hein Brand
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post #6 of 19 (permalink) Old 02-19-2010, 02:07 AM
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Berlina automatic is 14/ 46 or 11 / 41 euro specs.

montreal is 10/41

Maybe berlina or spider automatic US specs ??
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post #7 of 19 (permalink) Old 02-19-2010, 02:12 AM
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What about the Giulia Nuova Diesel?

Diesel engines have long final ratios...

Joo Vale
1965 Giulia Super / 1969 GT Junior / 1971 Junior Z
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post #8 of 19 (permalink) Old 02-19-2010, 04:11 AM
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Quote:
Originally Posted by jpv View Post
What about the Giulia Nuova Diesel?

Diesel engines have long final ratios...
Giulia Diesel is 10/41

Giulia Super "Biscione" 28th February 1969
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post #9 of 19 (permalink) Old 02-19-2010, 04:12 AM
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Quote:
Originally Posted by jpv View Post
What about the Giulia Nuova Diesel?

Diesel engines have long final ratios...
Hi Joo
the giulia diesels ratio is 10 /41 without lsd

Maybe a giulia diesel station

oeps finland was faster

Last edited by Dovali; 02-19-2010 at 04:13 AM. Reason: extra info
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post #10 of 19 (permalink) Old 02-21-2010, 02:21 PM
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Parts Catalogue shows that 12/43 is the rear axle for the 1990-93 2L Spider with automatic transmission (never sold in europe).
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post #11 of 19 (permalink) Old 02-22-2010, 11:38 AM
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Quote:
Originally Posted by d.albe72 View Post
Parts Catalogue shows that 12/43 is the rear axle for the 1990-93 2L Spider with automatic transmission (never sold in europe).
Aha!
Can you tell us the parts numbers or post a scan of that Parts Catalogue -page?

I have a book titled "The cars that made history - ALFA ROMEO DUETTO SPIDER" from Giorgio NADA written by Giancenzo Madaro. The author writes on page 93 that the US-version of the Spider 4 (MY91 : 1990 till 1993) had an optional automatic gearbox from ZF (3- Speed) with a LSD (also by ZF) and a final drive ratio of 4.10 : 1 (10/41) ... ?!

He could be wrong of course ... So any prove of your statement is highly appreciated

Ciao!
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post #12 of 19 (permalink) Old 02-22-2010, 12:50 PM
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Alfa published owner's and service manuals for the USA version S4 Spider state the differential ratios as;

manual gearbox - 4.10
auto gearbox - 3.60

What is not listed in these manuals though is the number of ring and pinion teeth.

Jim

Series 2 USA 1750 GTV (in Series 1 European clothing)
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post #13 of 19 (permalink) Old 02-22-2010, 01:08 PM
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Quote:
Originally Posted by papajam View Post
Alfa published owner's and service manuals for the USA version S4 Spider state the differential ratios as;

manual gearbox - 4.10
auto gearbox - 3.60

What is not listed in these manuals though is the number of ring and pinion teeth.
43 / 12 = 3,58333, that is near enough to 3,6 to make the latter an acceptable rounding off.

I will post the latest Fiat code when I will be able to get it, but bear in mind that you will never find such spare from fiat service anymore.

Here in Italy, Fiat used a fiscal law that allows to subtract from income (so reducing taxed earnings) the value of the out-of-catalogue goods when they are destroyed... I know of tenth of truks full of 2L Alfetta engines (America version, the best choosen after bench testing - thousands of them) transported to the near Falk plants to be grinded and melted.
Thats Fiat policy for "our" spares: they have so much to learn form germans!
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post #14 of 19 (permalink) Old 02-22-2010, 02:51 PM
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complete axle 96433451
ring and pinion 60520894

hope this helps
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post #15 of 19 (permalink) Old 02-22-2010, 05:00 PM
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44/8 ratio

Don`t wish to hijack this thread but as always much interesting unknown info appearing.

Does anyone know the source - fitted to what - of 44/8 axle ratio. It appears to be a special hill climb ratio but unlisted in my sources.

Richard
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