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996 4S Front Diff Rebuild

 
Old 02-28-2017, 05:23 PM
  #31  
rafaB
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Default 996 C4S front Differential... Bearings

Twinscroll,
I was looking at an awesome post that you did about rebuilding/repairing a front differential for a 996 C4S some years back.
Would you share where you got the Parts for your project, and the Specs to reassemble the differential? - if you even have part #/Bearing sizes that would be even better.
Thank you for your consideration...
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Old 03-01-2017, 06:18 PM
  #32  
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Dennis thanks for this.I am sure many C4S noobs think they have a Subaru coupe for winter driving :-).
Grateful to WWest for the comment that it is even worse in low temps.
I wonder what % of C4 owners think they have the ultimate Porsche-ice/snow/rain machine . I confess I almost bought one with that in mind so thanks to both of you for the education.
And here is a cost estimate for the record:
https://californiamotorsports.net/co...t-diff-service
Originally Posted by Dennis C View Post
Interestingly the AWD system on the 996 wasn't designed for additional traction in slippery conditions or winter driving. It was designed for improved performance on dry pavement. Your best bet for winter traction is proper winter tires, not the AWD system. The viscous coupling only drives the front wheels if there is a speed differential between the front and rear wheels, such as when the rear wheels are slipping. The PSM system prevents the rear wheels from slipping. Therefore, the front wheels don't do much in winter conditions. On the track or when cornering on dry pavement, the speed differential between the front and rear wheels allows the front wheels to engage and help to pull the car through and out of the corner more aggressively than a RWD car.
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Old 03-01-2017, 06:33 PM
  #33  
Dennis C
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No problem.

Don't get me wrong; my C4S was my daily driver in all conditions, including snow and ice. With proper tires, it did very well. Winter tires combined with the weight of the engine sitting over the primary drive wheels makes the car quite good in snow. Deep snow is the only real challenge.
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Old 03-01-2017, 06:40 PM
  #34  
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So sand bags in the Frunk +Nokians for winter ski trips ?
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Old 03-01-2017, 07:39 PM
  #35  
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A ski rack looks great on a 996 coupe, or you can fit a pair of skis in the cabin if you put the tails down on the floor in front of the passenger's seat and run them between the seats. Works like a charm!
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Old 03-04-2017, 04:49 AM
  #36  
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Hi Guys,
my front diff is leaking at the left drive shaft. Does anyone know the specs of the bearings?
Many thanks!
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Old 03-04-2017, 01:00 PM
  #37  
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Originally Posted by GreenOak View Post
Hi Guys,
my front diff is leaking at the left drive shaft. Does anyone know the specs of the bearings?
Many thanks!
1 Post and I have to tell you to read the very Thread you have posted your question in ?
Start at Post #1 in this thread and do use Search in future -you'll get much better responses.The theory is if you can't be bothered to Search ,it can't be much of a problem to you
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Old 03-04-2017, 01:20 PM
  #38  
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Originally Posted by Schnell Gelb View Post
1 Post and I have to tell you to read the very Thread you have posted your question in ?
Start at Post #1 in this thread and do use Search in future -you'll get much better responses.The theory is if you can't be bothered to Search ,it can't be much of a problem to you
Hi Schnell Gelb,

indeed I did read this thread as well as all other threads I could find on here regarding the 996 front diff. However, even now when re-reading the thread I couldn't find the specs for the bearings. Nevertheless it would be a great pleasure to hear back from you in case you are able to share them with us. I'm sure I won't be the only one who would very much appreciate that.

Many thanks and kind regards!
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Old 03-04-2017, 01:32 PM
  #39  
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LMGTFY
https://www.google.com/search?q=996+...utf-8&oe=utf-8

or try the PET -seals?
Seal - Differential Output, (40 X 60 X 9 mm)
Part #: 999-113-454-41-OEM
or 999.113.454.40 ?

Last edited by Schnell Gelb; 03-04-2017 at 03:57 PM.
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Old 03-04-2017, 01:43 PM
  #40  
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Porsche doesn't sell components of the front diff individually as spare parts. From the PET I can only get the part numbers of the complete diff and the seals. Thus, I was asking if anybody happens to know the specs of the *** bearings shown in the very first post of this thread.
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Old 03-04-2017, 01:53 PM
  #41  
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Please use the correct terminology.Do you really mean the specifications of the bearing or the part number or the Interchange .All are utterly different.
You find these things by googling, posting your findings and then asking. We've had some epic threads based on this simple premise of doing some work up front ,sharing and then working together.
And btw those of us in the biz usually buy bearings from a Bearing specialist.That is not the Porsche Dealer and that isn't what PET is used for.
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Old 03-04-2017, 02:26 PM
  #42  
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Sorry for not being precise in my terminology.

I plan to change the bearings and would like to get the parts before starting rather than getting the old ones out and then ordering new bearings based on the measurements of the old parts. Thus, the size of the bearings would be of great help. However, if you have part numbers of suitable bearings at hand this would be even better!

And regarding your accusation that I haven't put much effort into finding suitable bearings I can assure you, that I have read quite a few threads regarding this topic on here as well as on other sites such as pistonheads, PFF etc. However, I didn't come across any part numbers or description of the bearing sizes. In case I missed it, I'm utterly sorry for spamming...

Cheers
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Old 03-04-2017, 02:57 PM
  #43  
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"I didn't come across any part numbers"
The *** part number is clearly stamped on the edge of the outer race of the bearing - like most every other specialty bearing. You have to remove the diff to get the old bearing ....and then go to the local Bearing dealer with diff in hand.Since you live in Germany ,you probably would have some insights to share with us ?
That is how a pro does it here usually YEMV. We get our hands dirty first.
Replacing your leaking seal doesn't necessarily require a bearing replacement but I suspect we are still getting a cryptic ,piecemeal story so it is time to give up.
And why not share with us the most helpful of the posts you found on the subject you researched?

Last edited by Schnell Gelb; 03-04-2017 at 03:52 PM.
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Old 03-04-2017, 03:35 PM
  #44  
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Originally Posted by Schnell Gelb View Post
"I didn't come across any part numbers"
The *** part number is clearly stamped on the edge of the outer race of the bearing - like most every other specialty bearing. You have to remove the diff to get the old bearing ....and then go to the local Bearing dealer with diff in hand.
That is how a pro does it here usually YEMV. We get our hands dirty first.
If you had used a fraction of the energy you've used replying in this thread to actually try to help this guy out it would have been nice. Instead, you've wasted a bunch of his time (and anyone else's who's read it thinking there might be some useful information here), and clearly yours as well - which can't be very valuable since you keep posting this useless drivel... Is this really how "We" pro's do it?
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Old 03-04-2017, 03:50 PM
  #45  
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I told him where to find the bearing part number even though his problem is a leaking seal.I also gave the seal numbers. Contrary to what he claimed, the seals are available from Pelican and others.I did not want others who read this thread to be mislead. Even Amazon sell the seal !
This source may be of help and is on page 1 of the Google search for Americans:
Amazon Amazon
https://californiamotorsports.net/pr...t-diff-service.
Since he lives close to the *** H.Q. in Germany (according to his avatar)he has more opportunity than most of us to share some bearing research with other Rennlisters.I am only able(as indicated) to take the part to a local specialist bearing house and ask their advice. Even if you get a part number off the Internet it is foolish to trust it from a single source.It is equally foolish to rely on dimesnions only. Read the related epic thread on gearbox repair to see specific(expensive) examples of such mistakes and huge amounts of research shared by Rennlisters. That is how we roll on Rennlist.
Yes I was exasperated by the drip feed of vague info because it wastes time.The lack of any attempt to share links to diy info he found with others is very much against the spirit of sharing that makes Rennlist so useful to others who follow later.

Last edited by Schnell Gelb; 03-04-2017 at 09:15 PM.
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