Replacement diff carrier and quill shaft for flat 12's - Ferrari Life
 
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post #1 of 8 Old 05-12-2012, 09:13 AM Thread Starter
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Replacement diff carrier and quill shaft for flat 12's

As described in a series of earlier posts, Iím looking at various suppliers in the UK and Europe who have the ability to manufacture a replacement diff to suit the flat 12 cars of all years, 365ís, 512ís and all the Testarossa derivatives. I have had three prototype diffs manufactured which will soon be fitted to Testarossaís and 512TRís in Europe, UK and Australia.

Initial price indications were given and I moved forward to have a short batch made. I was apprehensive of the originally quoted price given the complexity of the Ferrari factory diff and as it turns out, my apprehension was well founded.

In the end I had to supply the company with a factory Testarossa diff which they stripped down and have been able to replicate the internals 100%. The external casing had to be modified and a far superior material used to obtain sufficient strength in what is actually a quite small housing. The housing has been manufactured from billet material and the end cap is fitted using 12 recessed cap screws, rather than big awkward bolts as the factory have used.

The work and quality of the materials chosen in the diff have pushed the price up substantially, but those members interested in a total replacement diff will still be very pleasantly surprised if they PM me for further information. This is a total drop in diff replacement. A billet housing with brand new cross shafts, spider gears and clutch plates. Itís not just a housing that you transfer your own innards into. Simply bolt your existing crown wheel to this new diff and fit it like any other replacement diff.

The materials and quality of workmanship are second to none. The company offers a lifetime warranty on the diff and also offers owners the possibility of various setups depending upon the chosen usage and driving style. The manufacturer has been making performance and racing diffs mainly for European vehicles for 30 plus years. They run out of a large modern machine shop in the UK and have experience in building differentials for a range of Ferrari cars including 512TRís and Mís.

I believe that in combination with the performance quill shafts available from Robert (Uzz32soarer) in Australia, and the UK differential that I can supply, we now have the ability to rectify the factory short comings in the drivetrains of the flat 12ís with total parts supplied for substantially under $5k USD.

I have posted an advert in the "buy and sell" parts section for anyone interested.

P.
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post #2 of 8 Old 05-12-2012, 09:18 AM
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they look nice may I ask who is the manafacturer

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post #3 of 8 Old 05-12-2012, 09:24 AM Thread Starter
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they look nice may I ask who is the manafacturer
I have had them commissioned to my specification and tolerances based on the original part at a diff manufacturer local to me.
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post #4 of 8 Old 05-12-2012, 01:31 PM
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Beautiful work Phil; I'm tempted and don't even own a flat 12 car! (550 owner)

From what I've read about the failure mode of these diffs, it seems having one of these would be a good thing at least for an insurance spare, and/or possibly change it as a preventive measure before the weld lets loose on the OEM piece, and all the flying bits take out the outer casing as well?

'99 550, Rosso Corsa / Nero, S/N:114654, Assy: 31836, Engine: 52084

High mileage, low compression, and missing on a few cylinders.....just like my cars.

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post #5 of 8 Old 05-12-2012, 01:47 PM Thread Starter
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Beautiful work Phil; I'm tempted and don't even own a flat 12 car! (550 owner)

From what I've read about the failure mode of these diffs, it seems having one of these would be a good thing at least for an insurance spare, and/or possibly change it as a preventive measure before the weld lets loose on the OEM piece, and all the flying bits take out the outer casing as well?
Right on there cribbj.
My Friend Mel in Holland, who I know is a careful driver, and Robert in Australia, the same, a careful driver, both had diff failures when the car was NOT UNDER LOAD. Mel's original estimate was nearly 25,000 euros for the rebuild. Really surprising that in both cases the car was in a low gear, not under stress, and in one instance changing down gear. I was gobsmacked when I heard the news from two close friends that the same problem occurred.
I looked into having a new diff carrier made and while it has taken some time to get it right, I have managed to get a diff to market that exceeds all the performance AND reliability requirements and comes in at a competitive price. And the diff has a lifetime guarantee. Now that can't be bad.

I have provided an advert in the "buy and sell" for your information.

P
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post #6 of 8 Old 05-12-2012, 02:16 PM
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Phil, from your ad, this new diff has now been fitted to at least one car that is seeing regular track time?

How many hours would you guess your longest running diff has accumulated?

Any changes in the recommendations for the gearbox oil?

'99 550, Rosso Corsa / Nero, S/N:114654, Assy: 31836, Engine: 52084

High mileage, low compression, and missing on a few cylinders.....just like my cars.

Maranello Skunkworks Team Member
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post #7 of 8 Old 05-12-2012, 02:25 PM Thread Starter
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Originally Posted by cribbj View Post
Phil, from your ad, this new diff has now been fitted to at least one car that is seeing regular track time?

How many hours would you guess your longest running diff has accumulated?

Any changes in the recommendations for the gearbox oil?
Hi cribbj, I don't know the total running hours but I did research into racing 512M cars here in the UK. They are all still running with NO failures and each is pushing about 750BHP!

The recommended gearbox oil is standard ferrari specification. However, I am experimenting with the LSD additive, if I can come up with a standard volume I will let you know. There are plenty of threads on how to add the LSD additive if you need advice.


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post #8 of 8 Old 06-17-2012, 10:28 AM Thread Starter
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You can now get the LSD from here along with other specialist parts:
Forza Components Ltd

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