Howdy..
Is it Part# 99642102001 ?

 

Nope is a C2.

Thanks to Loren I found the area.

 

I am now suspicious that I have the Pinion bearing whine issue.

I do get a whine on the motorway but what isn't explained is this axle play I get on that bearing

https://rennlist.com/forums/996-foru...read-this.html

 

I would suggest have a qualified transmission shop look at this. Clunking noises are not a sign of a worn bearing and just because the noise seemes to come from a certain spot, doesn't mean it actually does. The alumimium case of the transmission can easily distribute any noise anywhere. Some freeplay in the transmissiom is normal too, if you don't know what you are looking for, you can easily mistake them for failed parts. They you start throwing parts at it and it will get really expensive very fast. Have someone that knows more diagnose this for you.

 

Well I am stuck.

Mechanic pin pointed the issue exactly to the spot on the picture. Whining and clunking there. 2 tranny rebuilders said the same but said parts are an issue. Diff rebuilder said the same and didn't want to get involved after seeing parts diagram.

No one is willing to take on my car and just say get a new tranny


This is the problem


Issue is right in here :



Am thinking about just dropping it, tearing the back off and see what is what.

 

Do you know what to look for?

 

That is not differential area, and there is no differential fluid there. Arrows point to where differential is located and to where diff fluid is.

If there are no drivability symptoms and all you get is clunk, drive it as is. Since they are offering you to replace the tranny, what do you lose?

 

Hoping for a tapered bearing or something bearing like that I can get to fix it!

Can't stand to lose anything if the end result is going to be a rebuild or a 2nd hand unit going in

 

You can easily damage or destroy something that isn't part of a rebuild and then you have a useless core. As I said before, you need to know what to look for when you take it apart and I'm not convinced you have that.

 

I don't think the rebuild is in the future, hence he might as well drive it until it stops.

If his mechanic wanted to take the job, he would drop the tranny right now and open up the area in question to check for the bearing or gears that make noise. Clearly that is not the case.

You can get a used C2 tip for under $3k, and put it in as the whole. Keep the other tip for spares, as transmission itself is not a problem. The bearings/gears that transfer the power to the differential are the culprit here.

This transmission is backwards in the 996, hence the need for the extra gears and shaft to transfer the power back to the wheels. The problem in the OP's car is where the output shaft from the transmission meets with the shaft that transfers the power to the differential.




The OP's problem lies in the gears in the picture below. They link the transmission output shaft to the shaft driving the wheels. This is comparable picture, but gives you the idea of where the problem is coming from.

 

I have several of these transaxles, both C2 and C4 if you need one. I have a C4 unit with 40K miles, its not even dirty.

 

Oh wow, Flat6 is coming to the rescue people!!!!

 

Now that gives me a very clear idea. I do have some contacts for a company that manufacturers custom pinion gears!

Worst worst worst case scenario I am sure we can do something there!

OH man that picture really clears it up from a computer !!!!!

 

Unless your current tranny is deemed not rebuildable you are generally better off rebuiding the tranny that came of out the car. You know you have not abused the thing. A rebuilt tranny you have no way of knowing what condition it as in. Every part that is replaced affects the rebuilder's bottom line so there is a tendency to reuse parts that should not be reused. Also, in some cases the transmissions are torn down and the "reusable" parts binned then the transmissions are reassembled from the binned parts. The same reusable parts do not always get back into the tranny they came out of. Thus this can lead to increased wear and an early failure, though probably not within the warranty period...

The tranny is a ZF and ZF transmissions are common. In most major metro centers there are a number of good ZF tranny shops. Visit your local Porshce, M-B, BMW, VW dealers to find out where they send their autos for rebuilding.

 

Hi,

This is not a typical tranny issue.

If it was a clutch pack failure or a valve body issue or a TC issue, it would have been sorted out ages ago as that part of it is just run of the mill stuff!