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I have had that same issue shortly after I bought mine in June. Low speeds left or right hard turn. The dealer said that it was normal and there was nothing they could do. However, when I returned home I looked at the rear axle and there was oil on the axle where the filler plug would be. I found a TSB for 05-07 8.8 inch rears calling for a new clutch pack for older mustangs or adding a friction additive for mustangs built after 10/22/06. TSB # is: TSB 07-22-8. Can't remember where I found it. Noise has subsided quite a bit, but comes back every now and then. Man I hate dealers.

I am also having other issues with my drivetrain and will address them later in the forums when I get a chance. I just wanted to reply to this real quick.

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I have heard this argument before, that since it is a 'high-performance car' it makes 'high-performance noises.' To me that is a sorry excuse for poor engineering and quality control. I find it pretty embarrassing when I drive around a parking lot next to Nissans, Subarus, Mitsubishis, Porsches, etc. etc. etc. and my car is the only one that makes 'high-performance noises.' It seems that people that drive American muscle cars are the only ones who accept the shortfalls that their cars have.

My dad encountered the same excuse on a Corvette forum when discussing his noisy C6 Z06. Someone said, "it's a race car, it's gonna sound like a race car!" That's funny since the year after that, Chevy changed the design of the Z06 clutch packs that were making noises. Every dealership is gonna give you the same lame excuse when there is nothing they can really do about it. They don't have the technical knowledge to explain what's going on, and frankly they just don't care. Now that's not to say that there aren't some employees at dealerships that may want to help you out. They are just pressured from the manufacturer to keep warranty costs down and try to shoo the customer away.

Just look at the problems with our Tremec 5-speeds. They have been making them for how long in our Mustangs and they still have synchro problems? I guess that's what happens when they are 'Hecho en Mexico.' Look, I sell dimensional inspection equipment to manufacturing companies, and somehow I doubt how Ford's quality is equal to or better than its foreign counterparts. Sometimes I regret not buying a higher quality brand.
 

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RCSignals said:
It's the carbon fibre clutches, not poor engineering or poor quality control. I'm glad we didn't get the regular mill clutches for the Bullitt premium
How come there is a TSB for 8.8 inch Mustang GTs for the exact same problem? Manufacturer's don't issue a TSB unless there is a performance-related or customer complaint-related problem. In my opinion, that is a poor engineering decision. You might disagree, but I don't know why.

Is the Mustang (Bullitt or non-Bullitt, I don't know) the only car being made with carbon fiber clutches in its differential? Somehow I doubt it, but are they notoriously loud like ours? I drive a lot and hear a lot of other cars, have not heard something like that before. Like I said, it is embarrasing when compared to the Mustang's competition.
 
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