Manual Trans. Thud when shifting

[EXP Jawa]

Come on. Really? I've been following this thread since day one and do not recall ever reading such a complaint. And if I had, I would have asked the following:

How do you go from neutral to 1st without the clutch pushed in? And if the clutch is pushed in, how the heck are you lurching forward?

I don't see how this would warrant a "Come on. Really?" reply - what he's describing is pretty feasible if the issue stems from the clutch not completely disengaging. A lot of the symptoms, as I interpret them from these posts, seem to at least point toward that. But there do seem to be a lot of variables that influence the situation, however, that only widens the possibilities rather than rules any out. But basically, if there's some minor amount of drag torque across the clutch, that would be exactly how the heck it lurches forward.

At the end of the day, I wouldn't rule out the clutch being a factor, and if it is, it equally possible that someone might have one that's severe enough that the car lurches when put in gear. But that, at least, ought to be something that the dealer would have to take notice of. It'd be a lot harder to deem "normal operation"...

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[imissmy2j]

I don't see how this would warrant a "Come on. Really?" reply - what he's describing is pretty feasible if the issue stems from the clutch not completely disengaging. A lot of the symptoms, as I interpret them from these posts, seem to at least point toward that. But there do seem to be a lot of variables that influence the situation, however, that only widens the possibilities rather than rules any out.

At the end of the day, I wouldn't rule out the clutch being a factor, and if it is, it equally possible that someone might have one that's severe enough that the car lurches when put in gear. But that, at least, ought to be something that the dealer would have to take notice of. It'd be a lot harder to deem "normal operation"...

Thats what I thought as well. However after reading through the whole thing, the consensus is that the roughness of this trans is internal and not clutch/driveshaft or axle related . Of course at this point it is all specualtion, since to my knowledge no one has torn stuff apart and looked (which Ford should do at some point Lol):headbonk:

 

[dubster99]

I think sometimes the thud is so pronounced that it feels like a lurch. Mine does on occasion, and I can feel it in the clutch pedal...but the car doesn't move.

 

[foghat]

I don't see how this would warrant a "Come on. Really?" reply - what he's describing is pretty feasible if the issue stems from the clutch not completely disengaging. A lot of the symptoms, as I interpret them from these posts, seem to at least point toward that. But there do seem to be a lot of variables that influence the situation, however, that only widens the possibilities rather than rules any out. But basically, if there's some minor amount of drag torque across the clutch, that would be exactly how the heck it lurches forward.

At the end of the day, I wouldn't rule out the clutch being a factor, and if it is, it equally possible that someone might have one that's severe enough that the car lurches when put in gear. But that, at least, ought to be something that the dealer would have to take notice of. It'd be a lot harder to deem "normal operation"...

Perhaps, though I think it is a stretch based on the content of this thread. But, never say never, I guess.

Comment was more in context to this 500+ post thread (and other thud threads) and how no one (that I can recall) has stated their car has lurched forward because of the thud.

That and the fact that had this happened to anyone here even once, there likely would have been a pretty significantly sized thread on it. Maybe there is one one and I've somehow missed it.

Then couple it all with someone new to the forum (though, granted, that does not negate the fact he could be very familiar with the problem) implying that he has heard of multiple instances where the thud has caused a car to lurch forward, and you start to see why I shook my head in disbelief - so to speak.

Of course, I reserve the right to take my flipness back should at any time it is proven that the thud heard when shifting from neutral to first (while the clutch is depressed) causes the car to move forward.

 

[imissmy2j]

Perhaps, though I think it is a stretch based on the content of this thread. But, never say never, I guess.

Comment was more in context to this 500+ post thread (and other thud threads) and how no one (that I can recall) has stated their car has lurched forward because of the thud.

That and the fact that had this happened to anyone here even once, there likely would have been a pretty significantly sized thread on it. Maybe there is one one and I've somehow missed it.

Then couple it all with someone new to the forum (though, granted, that does not negate the fact he could be very familiar with the problem) implying that he has heard of multiple instances where the thud has caused a car to lurch forward, and you start to see why I shook my head in disbelief - so to speak.

Of course, I reserve the right to take my flipness back should at any time it is proven that the thud heard when shifting from neutral to first (while the clutch is depressed) causes the car to move forward.

Lmao dude I love that disclaimer at the very end. :lol:
Someone did mention the lurch before and there we're people chiming in saying that had the same thing happen. Lets hope mine doesnt do that ever. And on topic, I will try to post a pic of my official note from the dealership, the wording they use is pretty satirical.

 

[bken1313]

I gave up searching this thread for a solution after 10 pages of reading. Is there a fix for the Thud?

 

[Asharus]

yeah, get an auto

 

[foghat]

I gave up searching this thread for a solution after 10 pages of reading. Is there a fix for the Thud?

Nothing decisive.

I've seen one post where mgw shifter solved the guy's problem and maybe a post or two where one piece drive shaft did it (I could be misremembrering this though).

To counter, there have been multiple posts of people with new shifters, new drive shafts and new half shafts who have said they still have the thud.

 

[bken1313]

My 2008 GT also did it, but the 2015 is much louder.

 

[amilhazes]

In addition to trans whine, does anyone else feel strong vibrations coming from the clutch pedal upon releasing it immediately after shifting ?? Hard to explain. Feels similar to gear nibble on the shifter. But from the pedal, and felt thru foot. Shifts only performed after pedal is completely pressed to the floor, and released only after shift into next gear position.

 

[EXP Jawa]

Nothing decisive.

I've seen one post where mgw shifter solved the guy's problem and maybe a post or two where one piece drive shaft did it (I could be misremembrering this though).

To counter, there have been multiple posts of people with new shifters, new drive shafts and new half shafts who have said they still have the thud.

That's why I said that there seem to be a lot of factors that play a role here. We can't rule out clutch drag. We also can't rule out lube, the shifter design, design of the gearing in the transmission or general quality control.

Given the number of things that people have tentatively claimed as fixes (but have not worked universally), I'd tend to lean toward the latter. I have heard from someone I know inside drivetrain engineering that Ford is well aware of the NVH issues of the Getrag gearbox. He also said that they couldn't do anything about it, which struck me as odd - what sort of issue could a product have that Ford can't lean on the supplier to fix? In my experience, Ford can lean pretty damn hard...

 

[foghat]

That's why I said that there seem to be a lot of factors that play a role here. We can't rule out clutch drag. We also can't rule out lube, the shifter design, design of the gearing in the transmission or general quality control.

Given the number of things that people have tentatively claimed as fixes (but have not worked universally), I'd tend to lean toward the latter. I have heard from someone I know inside drivetrain engineering that Ford is well aware of the NVH issues of the Getrag gearbox. He also said that they couldn't do anything about it, which struck me as odd - what sort of issue could a product have that Ford can't lean on the supplier to fix? In my experience, Ford can lean pretty damn hard...

I generally agree. I'd be quite surprised if it were a clutch issue. If the clutch is not fully disengaging when the pedal is to the floor (and thus causing the thud) wouldn't one expect this to happen all the time, even in 5th and 6th gear shifts? And also, it is possible to go from neutral to 1st (or the other gears for that matter) with no thud - usually ust have to wait long enough before shifting into gear after shifting out of gear.

But who knows why this is really happening. I've heard similar stories about Ford not being able to anything about it. But they have all been from this forum. Though, I don't really consider the thud NVH (maybe it is), and any NVH I did have when I first got the car (and there was a fair bit) is all but gone now.

 

[EXP Jawa]

Well, NVH is a catch-all term for any undesirable noise, clunk, buzz, thunk, etc that can emanate from a part. A "thud" when putting into gear would certain qualify. Typically in gear systems, they're looking at clunk in the gear operation, which is generally the result of back lash. I know that they'd been looking at trying to reduce lash in other parts of the drivetrain to minimize the impact that the transmission issues had, but there's only so much one can do with that.

Regarding clutch drag, yes, it would likely occur all the time. However, what is making the car lurch is torque reaching the wheels and pushing it against what ever system lash there is and take up slack in the brakes. In higher gears, there is necessarily less torque multiplication, so the impact of the drag torque is minimized with each gear going up. For a fixed amount of drag torque, you'd have something on the order of 6 or 8 times as much torque reaching the rear axle in first gear as you would in the top overdrive gear, depending on the transmission ratios in question. So, the same clutch drag would be much less apparent in 6th compared to 1st. Just the same, I agree, it isn't likely the situation here. My original point was simply to answer the question of "how the heck could that happen if you've got the clutch engaged". To that end, it isn't unreasonable to see how it could happen if it did.

 

[Barrel]

The thud is internal to the trans IMO. I have a new clutch, flywheel, SS clutch line, shifter, driveshaft, and half shafts. Still have the thud. I personally don't find it offensive, but I know others have different NVH tolerances.

 

[FordService]

Deysha, We now have 28 pages of complaints from mustang owners about this thud. Everyone is being told it is normal. I for one and very disappointed in a $40k car that sounds like it has the transmission out of a 20 year old dump truck. What exactly is happening when you "escalate" these cases? It still seems as though Ford doesn't care. They have rubber stamped it as normal so what is really being done? Seems like absolutely nothing to me.

It’s all about documentation, John S.. If you’re experiencing this concern, be sure to address it with your dealer and let me know when you’re bringing it in. PM me with your VIN, dealer, mileage, full name, and best daytime number.

Apparently mine is on the easy side, some people report that theirs lurches forward a bit going n-1 like a freaking crotch rocket. So yeah same issue, some just a lot worse than others. None recognized by Ford.

I have not had anyone stating it lurches forward, imissmy2j. That should definitely be escalated. Also, as per my Technical Expert; 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.

In addition to trans whine, does anyone else feel strong vibrations coming from the clutch pedal upon releasing it immediately after shifting ?? Hard to explain. Feels similar to gear nibble on the shifter. But from the pedal, and felt thru foot. Shifts only performed after pedal is completely pressed to the floor, and released only after shift into next gear position.

Bring it in and get it checked out, amilhazes. Send me your info as well after you make your appointment.

Deysha

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