Manual Trans. Thud when shifting

[MagneticA]

But is this "thud" a recall item? Or simply a noise that is natural but wasn't dampened for whatever reason?

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[EXP Jawa]

But is this "thud" a recall item? Or simply a noise that is natural but wasn't dampened for whatever reason?

I'd guess that no, it isn't. It really sounds like an operating characteristic of this transmission design, a design that has been fully validated as such and is durable & sound. It just happens to be a characteristic that is objectionable. With that said, however, if there are enough complaints about it, they may still be motivated to address it, maybe as a TBS. From what I've read & heard, though, I do think that they have enough other issues with driveline NVH that this might be a low priority.

 

[FordService]

I'd guess that no, it isn't. It really sounds like an operating characteristic of this transmission design, a design that has been fully validated as such and is durable & sound. It just happens to be a characteristic that is objectionable. With that said, however, if there are enough complaints about it, they may still be motivated to address it, maybe as a TBS. From what I've read & heard, though, I do think that they have enough other issues with driveline NVH that this might be a low priority.

Here’s what I got after speaking with my Technical Expert, EXP Jawa. With the 2015 Mustangs, we have higher power outputs, so we have to have heavier duty transmission internals to deal with it. This will make for more noise when driven.

If anyone feels what you’re experiencing is not normal, please bring your vehicle in to your Ford Dealer and get it checked out.

Deysha

 

[EXP Jawa]

Well, as cover stories go, that one sounds plausible to the average person. But still, these are issues that could've been worked out in the design phase but were not. As someone that has experience dealing with Ford driveline engineering, I rather suspect that Getrag gave Ford that answer, it would certainly not fly.

 

[NotMarc]

I'm so glad I found this thread. Just got mine last week, and it's the one thing I don't like about the car besides the the mileage.

 

[John S.]

Here’s what I got after speaking with my Technical Expert, EXP Jawa. With the 2015 Mustangs, we have higher power outputs, so we have to have heavier duty transmission internals to deal with it. This will make for more noise when driven.

If anyone feels what you’re experiencing is not normal, please bring your vehicle in to your Ford Dealer and get it checked out.

Deysha

I've had higher Hp corvettes and Cadillacs that didn't have any noise in the drive train. :frusty:

 

[FordService]

Well, as cover stories go, that one sounds plausible to the average person. But still, these are issues that could've been worked out in the design phase but were not. As someone that has experience dealing with Ford driveline engineering, I rather suspect that Getrag gave Ford that answer, it would certainly not fly.

I understand where you’re coming from, EXP Jawa. If you’re experiencing this, please bring it in to your dealer and PM me with your VIN, dealer, mileage, full name, and best daytime number so I can escalate it.

I'm so glad I found this thread. Just got mine last week, and it's the one thing I don't like about the car besides the the mileage.

Be sure to bring yours in and get it checked out and PM me with your info as well, NotMarc.

Deysha

 

[Genxer]

I have changed everything , clutch , shifter , fluid , drive shaft ,clutch line , axles and I still have the same thud ...I guess we live with it until Ford fixes it by TSB or Recall ...You can send a report of this to the NTSB , might help if we all did ..? https://www-odi.nhtsa.dot.gov/VehicleComplaint/index.xhtml

Now we know what it is NOT, right? Thanks for taking one for the team, lol. At least you probably have a nice, upgraded drivetrain now. That makes the gearbox itself even more suspect to me.

Does anyone know of a documented failure of this latest iteration of the MT-82 on a stock car, disallowing suspected abuse? Either synchro failure or some other failure which does not allow operation? I am waiting to see what happens over time to the '15s. I'm not ready to scream that the sky is falling. To me it is a very minor annoyance.

 

[Tele5.0]

Now we know what it is NOT, right? Thanks for taking one for the team, lol. At least you probably have a nice, upgraded drivetrain now. That makes the gearbox itself even more suspect to me.

Does anyone know of a documented failure of this latest iteration of the MT-82 on a stock car, disallowing suspected abuse? Either synchro failure or some other failure which does not allow operation? I am waiting to see what happens over time to the '15s. I'm not ready to scream that the sky is falling. To me it is a very minor annoyance.

I am not sure about failure rate but I swear I have read a few posts where guys swapped out axles/driveshaft..etc...and it DID eliminate or decrease the "thud" :shrug:

 

[EXP Jawa]

It could well be that - as I've said before - the root cause of the thud is in the gearbox itself, but is exacerbated by added lash in the rest of the driveline. Basically, typical driveline clunk from R&P lash, slop in the splines, etc, amplify the thud that is emanating from the transmission. If true, then it stands to reason that in some cases, swapping out the axle shafts may reduce the severity of it, since you might get parts that fit together with less backlash. But that's really a case of putting a Band-Aid on the symptom, not the actual problem.

 

[Genxer]

I've read that Torsen rear tends to have a clunk by nature. Could be one thing people are hearing? When Top Gear drove a PP car across the U.S, some of the comments made were about how they didn't care for the trans or the Torsen. http://www.topgear.com/car-news/usa/road-trip-new-ford-mustang-vs-states-first-leg

We just have a noisy beast, but despite the quirks I love it.

 

[Hogie]

My diff makes a noise, but it isnt anything like the transmission thud. It also only does it when going slow around a turn. The thud is any time I upshift from 1-4

 

[EXP Jawa]

The Torsen differentials in this car actually have very low backlash compared to older models, and are in the same range (or even slightly better than) the clutchpack LSDs. Gearing has to have some lash in order to assembled and functional.

The difference here is that the Torsen does not have the spring preload that the LSD has (which is required to load the clutches). The preload masks the backlash of the diff gearing on casual inspection, because the spring force has to be overcome to feel it. But in actual operation, the car easily overcomes it. The fact that we observe the thud in non-Torsen cars tells us that the characteristic is still there.

But like I said before, the thud may be amplified by other factors - like shorter gear ratios, such as the 3.73:1 set that is only packaged with the Torsen.

Also, as far as I can tell, Top Gear's only gripe with the Torsen is that they perceived that it was the source of the driveline clunk (or possibly thud), when in fact they really have no idea what the contributing factors are. They just assume. As we've witnessed here in this group, the situation is a bit more complex than that.

 

[Barrel]

I've changed out everything but the MT82 and still have the thud so I'm more inclined to believe it's inside the transmission. Doesn't bother me (I had an audible whine that drove me crazy) but I can see how it would bother some.

 

[Budnr22]

I've changed out everything but the MT82 and still have the thud so I'm more inclined to believe it's inside the transmission. Doesn't bother me (I had an audible whine that drove me crazy) but I can see how it would bother some.

I have the whine too. Did you figure out how to reduce the whine?

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