Manual Trans. Thud when shifting

[Nemesys]

The noise level matches the RPM too. Windows up, blower down to hear better.

I think Ive heard what youre talking about.

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[Nemesys]

So, is Ford going to diagnose hundreds of cars before for no reason if it's "normal" operation? Over 90 % of GT's and specially those with PP are experiencing this in some way. I understand its first year problems or issues, but the MT-82 has been around for the whole s197 generation and now in s550. Can we just get a simple answer from Ford as yes, this is normal or no, this is an issue?


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Not sure what kind of response youre looking for but a lot of BMWs with Getrags experience the same thing as well as other performance manual vehicles. There are three basic "stages" in a manual transmission drivetrain: the engine, the transmission, and the driveshaft/differential/drive axle. The clutch controls the link between engine and transmission, and the shifter controls the link between drivetrain and transmission. As you can well imagine, the transmission is the intermediary stage between the engine and the physical drive components.

When you're putting the shifter into gear, you're essentially forcing everything in and between the transmission and differential/driveshaft to sync up. A mild thud is just an indication that some mechanical bits are shifting around to make this possible.

 

[Ruby305GT]

Not sure what kind of response youre looking for but a lot of BMWs with Getrags experience the same thing as well as other performance manual vehicles. There are three basic "stages" in a manual transmission drivetrain: the engine, the transmission, and the driveshaft/differential/drive axle. The clutch controls the link between engine and transmission, and the shifter controls the link between drivetrain and transmission. As you can well imagine, the transmission is the intermediary stage between the engine and the physical drive components.

When you're putting the shifter into gear, you're essentially forcing everything in and between the transmission and differential/driveshaft to sync up. A mild thud is just an indication that some mechanical bits are shifting around to make this possible.

I am not looking for a particular response, but also NOT a "bring it in for a look" for a thud from Ford. If its a non-issue, then why bring it in? I just dislike miss-direction, if that's what we may call it. Reading that, leads me to believe I may have an issue too and should bring it in for an inspection? Everyone here pretty much dismisses it, or doesn't care for it, heck they even call it "normal". So what is it?

I am aware of how the transmission and drive-train operate, wont call myself an expert, but I can definitely hold my own. It would be nice to know where it is coming from; whether the dual piece DS, clutch/pressure plate, flywheel, synchros, just what the heck is it?

 

[robb]

I am not looking for a particular response, but also NOT a "bring it in for a look" for a thud from Ford. If its a non-issue, then why bring it in? I just dislike miss-direction, if that's what we may call it. Reading that, leads me to believe I may have an issue too and should bring it in for an inspection? Everyone here pretty much dismisses it, or doesn't care for it, heck they even call it "normal". So what is it?

I am aware of how the transmission and drive-train operate, wont call myself an expert, but I can definitely hold my own. It would be nice to know where it is coming from; whether the dual piece DS, clutch/pressure plate, flywheel, synchros, just what the heck is it?

I tend to agree. Ford engineers know the thud is there and can easily pull any PP car into their shop and find out where it's coming from. This bottoms up approach of making hundreds of people take it to the dealer and having techs hope to find the reason is silly. Just pull one into the factory and find the issue.

 

[Nemesys]

Lol the engineers don't have a clue either. Ask me how I know

 

[Ruby305GT]

Lol the engineers don't have a clue either. Ask me how I know

Heheheh, I'm glad we're on the same page.


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[Ryan1112]

I understand that Ford needs to diagnose by hearing it for themselves because you can't rely on just our descriptions. That said, if so many of us have noticed this sound you'd think that they would know what we mean by now and tell us if it's normal or not. I don't really want take off work to go to the dealer when I already know what they are going to say. I'll be told it's normal, they are documenting it, they will let Ford know, they'll call me if.... blah blah.
It sounds like syncros to me. Since it only does it from 1-2 and 2-3 shifts and I can make it go away by double clutching or shifting slower I don't really see how it could be anything else.

 

[Ruby305GT]

When I left work today, while the car was warming up as usual, I don't get the thud. Once the car warms up I start getting the thud randomly. When I got off the highway I didnt have the thud. Next light, I got the thud and I started experimenting. So, some people say pressing the clutch for a few seconds then putting into gear prevents it, didn't work. I tried to double clutch and into gear, same light, didn't work. I started pressing the clutch and putting into gear back to back without pressing the brakes and I repeated this about 4 times. Everytime the thud came, I saw the car move forward as if someone bumped it. The thud, in other words, would move my car forward ever so slightly. Imagine someone kicking the back of your bumper. That leads me to believe the clutch is not disengaging and there is still some inertia being put through the trans shaft.
Have we confirmed the GT does NOT have a dual mass flywheel?

Any thoughts?


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[Nanashii]

When I left work today, while the car was warming up as usual, I don't get the thud. Once the car warms up I start getting the thud randomly. When I got off the highway I didnt have the thud. Next light, I got the thud and I started experimenting. So, some people say pressing the clutch for a few seconds then putting into gear prevents it, didn't work. I tried to double clutch and into gear, same light, didn't work. I started pressing the clutch and putting into gear back to back without pressing the brakes and I repeated this about 4 times. Everytime the thud came, I saw the car move forward as if someone bumped it. The thud, in other words, would move my car forward ever so slightly. Imagine someone kicking the back of your bumper. That leads me to believe the clutch is not disengaging and there is still some inertia being put through the trans shaft.
Have we confirmed the GT does NOT have a dual mass flywheel?

Any thoughts?


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These are my observations as well. Our cars appear to be behaving exactly the same when it comes to the 'thud'.


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[Ruby305GT]

These are my observations as well. Our cars appear to be behaving exactly the same when it comes to the 'thud'.


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At least I'm not the only one .


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[Nemesys]

Much like my weird noise I get at idle on cold starts, you're going to probably go down a lot of rabbit holes before coming to the acceptance that its just normal. Unfortunately, we dont have engineers on this forum from Ford to answer our questions. We only have customer service reps that get us in touch with CSMs for warranty work. lol Ford pulled my entire trans because they thought it was one thing, but it wasnt. They even went as far as replacing a PCV valve :shrug: Ford was kind enough to give me an ESP for my problems so Im thankful for the piece of mind I guess. The car drives perfectly and performs like a champ.

Like I said before, the dealer replaced a ton of parts on mine because they didnt know wtf to do. I have paperwork of them acknowledging a "sound", but outside of that, I wasted a month of my life without my car lol

What I would suggest is this. Go stop by your local dealer, speak with a service rep. Ask them if you can schedule a test drive and let them feel that little thump/thud and see what answer they tell you. Doesnt require you to get a rental, doesnt require you to leave your car.

Not sure if you read the thread, but when the dealer installed my springs, they installed one upside down. I had the oppurtunity to have a tech ride with me to test the alignment, and I brought this exact same concern up and he went into what it is and explained it in a way I understood and it made sense. The tech has owned a lot of Mustangs in the past and he didnt feel that it was anything to be concerned about.

 

[Ruby305GT]

I hate to be the bad guy, but I'm tired of the dealers dismissals of walk ins with nothing they can make money off of. Unless your car is broken, you would be dismissed as "normal" operation. It's documented, great, but once you are out of warranty, you're on your own. Usually, out of warranty is when things give.


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[Nanashii]

I've already accepted that it's 'normal'. The only thing I will do is get it thoroughly documented during one of the next maintenance visits. It appears to be a 'feature' on so many of our cars...I wouldn't lose any sleep over it.

 

[Ruby305GT]

I've already accepted that it's 'normal'. The only thing I will do is get it thoroughly documented during one of the next maintenance visits. It appears to be a 'feature' on so many of our cars...I wouldn't lose any sleep over it.

Agree, just hoping this feature is a safe feature.


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[FordService]

So, is Ford going to diagnose hundreds of cars before for no reason if it's "normal" operation? Over 90 % of GT's and specially those with PP are experiencing this in some way. I understand its first year problems or issues, but the MT-82 has been around for the whole s197 generation and now in s550. Can we just get a simple answer from Ford as yes, this is normal or no, this is an issue?


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Hey Ruby305GT,

As I was telling Ryan1112 in PM, the best way for Ford to track such issues is for them to be diagnosed at the dealer. Similar concerns may have different root causes, even though it has the same symptoms. I'm unable to state whether a specific situation is considered normal or not however, as I'm not a certified tech. I can only assist in the process that Ford has in place for such cases.

Jeff :ford:

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