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Another Diff Bites The Dust…

Discussion in 'Boxers/TR/M' started by RQtetto, Jan 18, 2014.

  1. Melvok

    Melvok F1 World Champ
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    Jul 25, 2008
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    Good Luck Brad.

    As ever: please have photos taken (for us)of the many steps in the process of replacing the upgraded diff.

    Your diffs will all follow .... it's not a matter of IF but it's a matter of WHEN .... they will all go.

    Be in time ... avoid massive costs.
     
  2. Bradwilliams

    Bradwilliams F1 Rookie
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    How many miles were on your car when yours went Mel?
     
  3. kerrywittig

    kerrywittig Formula 3
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    Nov 10, 2005
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    If anyone is looking for a stock OEM diff I have one....$1100 shipped

    Diff erent Me
     
  4. turbo-joe

    turbo-joe F1 Veteran

    Apr 6, 2008
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    romano schwabel
    broken or ok :)
     
  5. kerrywittig

    kerrywittig Formula 3
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    In great original condition... came out of my 87 at 45k. Replaced it with a billit diff from Newman..

    Preventive Me
     
  6. turbo-joe

    turbo-joe F1 Veteran

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    for using this diff as an ashtray too expensive for me
    then I better use my broken diff - even I´m non smoker :)
     
  7. JB833

    JB833 Karting

    Jan 3, 2015
    106
    London
    Hi, I have just bought a Testarossa and asked the garage about diffs. They said they have only ever seen three go and it is not a foregone conclusion. I was prepared to change the diff but they have said don't bother. I am unsure what to do. Why do you say they will all go? Just curious..
     
  8. turbo-joe

    turbo-joe F1 Veteran

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    then go again to the garage and they may give you a warranty that the diff will not break. otherwise they may pay all the additional material and labor.
    it is only a question of "when will it break", not "if"
     
  9. Bradwilliams

    Bradwilliams F1 Rookie
    Silver Subscribed

    We should start a poll on the percentage of diffs breaking in these things LOL.

    From what I've heard it sounds like a total crap shoot. Many including myself think that it depends on how the car has been driven. Many were clutch dumped their lives. Hard to connect the dots though if you ask me. Sounds like Vegas.
     
  10. JB833

    JB833 Karting

    Jan 3, 2015
    106
    London
    I'm going to asume that more diffs haven't broken than have unless someone can tell me otherwise.
     
  11. turbo-joe

    turbo-joe F1 Veteran

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    may be you are right - but may be not

    but when the diff breaks then there is a lot of more to fix and that will get very expensive

    same as with the fusebox, but there the costs are much lower

    preventing and to be on the safe side I suggest - but everything to his own

    as newman also said: the diff may be broken without you feel it, but when you dismantle then you see it. when you are so far you are lucky - but mostly nobody sees ist and some day it will destroy much more things
     
  12. dwhite

    dwhite F1 Rookie

    Same with timing belts, but they get changed way more than necessary.

    I drive my cars, so when I bought my boxer there were 2 things I wanted to do immediately; replace all the suspension bushings and do the diff as a peace-of-mind preventative mait., the major was done the prior year by Ferrari. When I did the Newmann diff I also did a bunch of things which don't get done on a typical major and corrected those which they did poorly. I do drive it alot (7-8K in the last 3 years) so it was good money spent and 2 1/2 months of my time.

    It's all personal choice and if I were a waxer polisher type, I probably would not have bothered doing suspension or diff., then again I would never have bought a boxer.
     
  13. turbo-joe

    turbo-joe F1 Veteran

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    I never heard that the diff in a boxer is broken

    but the example with the timing belts is perfect ! ! ! :)
     
  14. Natkingcolebasket69

    Rossa Subscribed



    Great post! I so wish it doesnt happen to me. I try to do everything you said. Knock on wood!


    Sent from my iPhone using Tapatalk
     
  15. ago car nut

    ago car nut F1 Rookie
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    IMHO, I think it happens because of improper stress relieving after welding. I do not believe it will happen to everyone.
     
  16. ozziindaus

    ozziindaus F1 Veteran
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    Aug 16, 2012
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    Very possible. I also think it has something to do with the hand grinding/cleanup after weld......at least it appears that way. Very inconsistent and uncontrolled process.

    But, if the same diff was used on the Boxer and they rarely ever break, then it must also have something to do with the increased horsepower of the TR.

    Here's a Cause and Effect Analysis we started a while ago

    http://www.ferrarichat.com/forum/144747814-post179.html
     
  17. Melvok

    Melvok F1 World Champ
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    This diff was made for handling 300 HPs Sam ... in the 365 and 512bbs

    Not 400 HPs or even 426 (512TR) ...

    That's why ...
     
  18. ago car nut

    ago car nut F1 Rookie
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    Installing a Newman diff in my TR even if they all don't break.
     
  19. Newman

    Newman F1 World Champ
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    The welds got lighter over time. Look at a 365 boxer one and it has such a fat bead they have to machine them down to clear the left side support. The BB512 got a lighter weld that had the high spots machined off, Testarossa ones have a smaller weld that needs no machining step! The down-side......kaboom!
     
  20. Newman

    Newman F1 World Champ
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    Thank you again :)
     
  21. godabitibi

    godabitibi F1 Veteran

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    That's what I did and had peace of mind everytime I drove the car. I still have my unbroken OEM and it does a great job on the shelf.
     
  22. stardoc

    stardoc Formula Junior

    May 5, 2005
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    So, to recap. How much are you guys paying to install a Newman diff?
     
  23. Bradwilliams

    Bradwilliams F1 Rookie
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    I'll let you know the labor cost when mine is wrapped up.
     
  24. Melvok

    Melvok F1 World Champ
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    That is a good idea ! :D
     
  25. turbo-joe

    turbo-joe F1 Veteran

    Apr 6, 2008
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    romano schwabel
    it depends if you let it do just when the engine is out for a major service or only change the diff with the engine in the car.
    when the engine is out I need between 3 and 6 hours, it depends how often I have to remove the diff for shimming and adjusting the bearings and also check the play between crown and pinion
     

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