Another Diff Bites The Dust…

Not sure it makes sense to do one in the car given the aggravation to avoid just dropping it out and 3hrs is too lean when you clean everything, change axle seals, install new bearings and install it minus a crown gear to check preload. Then if no adjustment is required you install it again with the crown gear to check backlash and pattern. I haven't had to adjust one yet but Ive heard the odd one does. Mine are all within a tenth so it depends how accurately made the originals were not to mention if they were ever tampered with during previous repairs effecting setup. If you have to adjust then that adds time and a possible shim charge particularly the large RH shim.

 

the 3 hours are when the engine is out and all cleaned already, so only changing the diff. but then also only when you don´t have to adjust anything and all is matching.

to do this job with engine in the car I never said to do this, but others here in the community said it would be ok also

 

Best imo is to exchange te diff when the engine is out.

 

Cleaning "everything" is outside of the service labour time so your 3hrs is still misleading. Try charging 3 hrs to do a diff job plus book time on a belt service and see where you end up.

 

I have change three; Basicly if you do it first time, clean everything, do it really accurately so you do not get leak from driveshaft side and you do not need to open evrything afterwards. Engine in car, nothing exploded it takes me one day to to get evrything out and change bearings, even get bearing preload in range in first day. Second day I would change shimms coulple of times under that bearing and get good contact. on third day I would get everything back. So reality after done this three times is 3 days engine in, you do not want to rush this one fast.

 

How old was your belt when it broke?

 

how old in km/miles and in time please

 

You can read how it all went down for the poor guy here.

http://www.ferrarichat.com/forum/boxers-tr-m/281914-i-turned-key-my-%24%24%24-flashed-before-my-eyes.html

 

I just heard about one diff going bad couple of weeks ago, not from my country, owner can comment if reads this.

I saw picture from diff and it was diff halfshaft (not driveshaft) cut broken out from left side, there was no better bicture, so I don't know how bad was rest of diff or gearbox.

 

thank you for the link clark
was reading all.

but 4 years and not even 10k miles?
sure oil can destroy the belts or even make them "soapy". that is why I never use synthetic oil, because this is more aggressiv to rubber than normal mineral oil

 

Ask him to react here please Mikael !

 

I have some pictures on my phone. I'll put them up when the car is finished.

 

Thanx Brad !

 

Well I got the car back about 5 days ago and it feels as strong as the last day I drove it. It had been at my mechanic for 6 months. Anyway $18.5k in service later, I now have a car with an upgraded diff. and gold kit. Doesn't get much better than that Car was solid and reliable before but now it is bomb-proof. Also replaced some axle boots while the motor was out and did the major service along with a stripped brake proportioning valve and line. I also had to have some machine custom shims for the differential. And A new waterpump seal (apparently these are flaky after ferrari switched suppliers). I made sure to save the belts and they look near perfect after 7 years of use. Which just goes to show you if you drive your Testarossa, then you can wait at least 8-10 years before doing the major. If you don't then you're stuck doing it every five.
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what valve you mean? never heard about a proportioning valve

 

18,5k? Jeez that’s a lot. An upgraded diff is like 5k service is another 8k what made it go from 13k to 18,5k?


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Must be the "GOLD kit" ...