512TR & Testarossa Diff?

I have been told that most of the 512 transmission parts can be retro fitted to the Testarossa either as direct replacements or with minimal mods.

Andy

 

If you want i diff that won't fail again no matter how hard you drive..contact Modena Engineering. They make a full race spec diff that is also perfect for the street. I have installed 3 of these units and NEVER had a problem. It is expensive but well worth it.

 

You can also try and source a used 512M differential.

 

I don't have any hard evidence that a 512TR and 512M transaxles are different. None of my literature says anything about a transaxle upgrade betweent he two models

Can someone confirm that the relevant part numbers are different?
I can't believe Ferrari would have done a redesign just for an extra 11HP/?? torque.

Yes, people say it was marginal on the 512TR, but did Ferrari think that was as well?

I have asked the local delear, and he doesn't believe they are different. I don't know, maybe he is wrong.

 

It was for reliablity as well, as TR's differentials have a habit of snapping under excessive load.

 

Sure, but what I am getting at is the trans was already significantly upgraded from the TR to 512TR.

The only way to make sure is to compare the P/N?
unfortunately, I only have the part books for TR and 512TR, not the M.

 

Quite true, I will find out and get back to you.

 

512 Diff's will fit in the TR's, the part numbers have changed a couple of times with different upgrades.

Also the 512 differential has been modified as shown below

 

The parts are manufactured by ZF, and I've found that on many occasions the preload and mesh is more dependant on casing manufacture rather than gear componentry...meaning new crown/pinions often go straight in with minimal if any re-shimming.

Of course, you must ALWAYS check, but I'd say 4 out of 5 times they go straight in.

If changing a case, they ALWAYS need re-shimming.

The Modena diffs are great. they are supplied with "in car" adjustable diff settings and are top quality....but they need re-shimming for bearing preload at the very least.....

 

So is there a difference between 512TR and 512M diff?

 

Yes ants...it's all in Malcolms information...

TRossa 103262
TR 146769
M 155099

the hardest part with Ferrari workshop manuals is extracting the info. It loses something in the translation I think, but it's all there somewhere!

 

All makes sense now. Thanks.

 

Arrrghhhh, it just dawned on me, I have a sh$t differrential

 

A friend blew his 512TR transaxle...the local FNA dealer recommended a new 512M trans as the "upgrade"...$25k later....and three months, fixed. He has had no further troubles, and drives the car frequently and "spiritedly"!

Dave

 

Ok, I have checked my parts manual, and it all conquers with the below. Sad but true

One thing I want to ask, that excert talks about a new differential housing.
Is it talking about the G/box housing?

or is it referring to part number 1?
if so, is that what usually gives way?

I thought it was the driveshaft that was the weak link, or is it both?