Manual Trans. Thud when shifting

[woofwoofdroolyface]

Steeda's wrap up comparisons are pretty hilarious. It doesn't actually compare it anything real that I've seen? Definitely not comparing it to BMR's pieces. They're so assumptive lol.

Yeah, it's definitely an advertisement but it shows how bad the stock mounts are. BMR mounts will have less movement than the Steeda poly mounts.

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[fogus]

Vid here demonstrating the issue: [ame]

Watch at 3:09 ( ) and you'll actually see the whole image vibrate as the car lurches with the camera mounted to the proclip.

 

[Asharus]

if you guys google first gear thud, clunk or thump, you'll see that it's not an isolated issue to s550s.... anywhere from new to old bimmers, subaru/scion BRZ/FRS, etc.

 

[WeinerDog]

if you guys google first gear thud, clunk or thump, you'll see that it's not an isolated issue to s550s.... anywhere from new to old bimmers, subaru/scion BRZ/FRS, etc.

All the more reason we shouldn't have this issue in these cars. It's funny, when it happens at a stop going to first I don't really care. It's much, much worse going 1-2 or 2-3 in my car.

I've ordered the Steeda kit and will have it installed ASAP. Fingers crossed. Decided against the BMR as apparently there is an issue and they are redesigning their kit.

 

[FordTechOne]

Vid here demonstrating the issue:

Watch at 3:09 ( ) and you'll actually see the whole image vibrate as the car lurches with the camera mounted to the proclip.

You can't be serious.

EVERY vehicle with a manual transmission will do that. Here is why:

When the transmission is in gear with the clutch depressed, the input shaft is directly engaged to the wheels. Therefore, it is stationary. As you change gears, all of the internal components in the transmission remain stationary.

When you let the clutch out in neutral, you spin up the input shaft to the engine speed. When you release the clutch, the input shaft continues to freewheel since the transmission is in neutral.

When you place it in gear with the input shaft freewheeling, the synchronizer needs to match the speed of the input shaft with the speed of the gear being selected. Therefore, the synchro needs to reduce the speed of the input shaft to zero RPM. This is accomplished through the use of a blocking ring, synchronizer hub, and shift fork. The blocking ring contains a friction material (carbon fiber, bronze, composite, etc) that acts as a clutch to speed up or slow down the gear. The synchronization of the speed gear is the clunk noise and resistance you feel in the shifter when you engage the gear. Once the input shaft is stationary, the gear can then be engaged. All that happens in the couple tenths of a second it takes for you to move the shifter from neutral to 1st gear.

 

[WeinerDog]

You can't be serious.

EVERY vehicle with a manual transmission will do that. Here is why:

When the transmission is in gear with the clutch depressed, the input shaft is directly engaged to the wheels. Therefore, it is stationary. As you change gears, all of the internal components in the transmission remain stationary.

When you let the clutch out in neutral, you spin up the input shaft to the engine speed. When you release the clutch, the input shaft continues to freewheel since the transmission is in neutral.

When you place it in gear with the input shaft freewheeling, the synchronizer needs to match the speed of the input shaft with the speed of the gear being selected. Therefore, the synchro needs to reduce the speed of the input shaft to zero RPM. This is accomplished through the use of a blocking ring, synchronizer hub, and shift fork. The blocking ring contains a friction material (carbon fiber, bronze, composite, etc) that acts as a clutch to speed up or slow down the gear. The synchronization of the speed gear is the clunk noise and resistance you feel in the shifter when you engage the gear. Once the input shaft is stationary, the gear can then be engaged. All that happens in the couple tenths of a second it takes for you to move the shifter from neutral to 1st gear.

Thanks for the info but why should I or any of us care about all that? I don't care much how my air conditioner works...as long as it works.

Why do I have to hear this obnoxious sound?

 

[FordTechOne]

Thanks for the info but why should I or any of us care about all that? I don't care much how my air conditioner works...as long as it works.

Why do I have to hear this obnoxious sound?

Because that's the way mechanical devices work.

If you don't like it, then walk. Ignorance of the laws of basic physics is not anyone's problem but your own.

 

[WeinerDog]

Because that's the way mechanical devices work.

If you don't like it, then walk. Ignorance of the laws of basic physics is not anyone's problem but your own.

:lol:I and others here have had many other vehicles with manual transmissions that don't do this. They were/are "mechanical devices", no? How come some do it and others don't?

You may be 100% correct about what's going on inside the tranny but how about coming up with an idea of how to stop the sound getting into the interior instead of berating those of us seeking a solution?

What do you think could isolate this sound?

BTW, do you really work for Ford?

 

[Asharus]

that's why i havent given any thought to this thud when i heard it, because i understand what is going on, and it's not just a "black box" to me.

the only reason i have given this any thought is because of this thread. it's obviously a concern to everyone else, and it's been a pretty interesting 50 pages so far....

 

[FordTechOne]

:lol:I and others here have had many other vehicles with manual transmissions that don't do this. They were/are "mechanical devices", no? How come some do it and others don't?

You may be 100% correct about what's going on inside the tranny but how about coming up with an idea of how to stop the sound getting into the interior instead of berating those of us seeking a solution?

What do you think could isolate this sound?

BTW, do you really work for Ford?

Every manual transmission does this regardless of vehicle. It's the nature of how they operate. It may be more apparent on RWD applications that use a direct shift linkage or a remote linkage with high durometer bushings. The stiffer bushings improve shift feel at the cost of some additional NVH. These are performance cars, the majority of owners would rather have a stronger shifter with better feel at the cost of some slightly higher NVH levels.

There is no need to "stop the sound" or "seek a solution", it's a normal characteristic of a manual transmission.

I work in the automotive industry, so I work with Ford vehicles, along with many other brands of vehicles.

 

[ridenfish39]

My Mazda 6, WS6 TA, 04 Acura TL, Mazdaspeed 3 and my 2012 Mustang GT did not thud when engaging first, and shifting 1-2 and 2-3. My 15 Mustang GT does. Why is that? LOL.

 

[Ayabe]

My Mazda 6, WS6 TA, 04 Acura TL, Mazdaspeed 3 and my 2012 Mustang GT did not thud when engaging first, and shifting 1-2 and 2-3. My 15 Mustang GT does. Why is that? LOL.

Because you're lying, dumber than Mr Jiffy Lube Tech, can't drive a manual and should basically kill yourself for suggesting Ford has dropped the ball. :cheers:

It still boils down to people that know better and those that don't. It's not a normal sound, it's not a thump akin to anything in an M car and people suggesting that don't know dick.

 

[ridenfish39]

Because you're lying, dumber than Mr Jiffy Lube Tech, can't drive a manual and should basically kill yourself for suggesting Ford has dropped the ball. :cheers:

It still boils down to people that know better and those that don't. It's not a normal sound, it's not a thump akin to anything in an M car and people suggesting that don't know dick.

LOL

In all honesty though....aside from the thud, the MT82 in my 15 shifts better than my 12 GT did. That car had the left turn nibble thing. Never had a problem with it otherwise in 45 k miles though. My 04 TL wouldn't shift for shit 2-3 when it was cold out. I have no issues with that in my 15. Aside from the thud the trans is perfect. I only have the Steeda shifter bracket and I really don't feel the need to upgrade the shifter as it's only a daily driver.
The thud does concern me though, it seems like something that will accelerate wear in the trans. I can avoid it when engaging 1st just by giving it a second before putting it into gear, but the 1-2 and 2-3 shifts usually thud no matter what.

 

[mustang_guy]

that's why i havent given any thought to this thud when i heard it, because i understand what is going on, and it's not just a "black box" to me.

the only reason i have given this any thought is because of this thread. it's obviously a concern to everyone else, and it's been a pretty interesting 50 pages so far....

Its the minority making a mountain out of a mole hill. All manual transmissions have quirks and flaws with their design. Ive never driven a flawless manual transmission. As long as i can bang out the gears without it giving me trouble going into gear i dont care much. But this is coming from someone that doesnt mind dog boxes. :lol: The minorities always speak the loudest.

 

[montreal ponies]

My 2011 GT didn't have the thud, neither does my friend's 2013 CS, neither did his 2012 GT....

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