Manual Trans. Thud when shifting

[Hwy1]

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.

First off you are only going by what you have read and not really heard.
I have have many manuel shifting cars and know some make normal noises.. This is not normal nor is it the gears grinding together..
There is a issue , my dealer here'sit, feels and had my car for 10 days and could not figure it out we drove 4 cars the same all were different, but made this noise only one did not
When Ford figures it out a buliten will go out and we will know till then turn up the audio and enjoy the car
There are people on here looking for a fix.. Berating them is not helpful

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[CB]

We all know that a manual trans. will make some sort of noise when going from idling in neutral, pushing the clutch pedal and immediately going in a gear. And we do know that some have a problem with the thud every time they shift. That video from a few pages back shows us just how much that rear end moves around. Each bolt fastening point that has rubber isolators can move. What if the factory installed the rear end just a little bit crooked and now you have a bolt or two hitting metal. The thud would sound like a bolt that's holding something that is heavy and the sound being muffled by rubber. Going through these posts I never paid much attention to what model years of cars that are doing this. Maybe it doesn't make any difference. My car does not do this, yet. But mine was made the second week of September 2015.

 

[fogus]

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.

I asked about that exact point in post #800 (physics and all). The current theory is a lack of appropriate isolation in this Mustang, not that there is something broken in my car.

 

[Hwy1]

Well this is just perfect... I took my car over to my buddy and told him to test drvie it and tell me that the steering felt ok....
He sells high end car's etc....
He took the car out for maybe 10 min. came back and said nice car, seems to steer just fine ( which it does ) WTF is wrong with transmission????
Ha, I never mentioned it to him...
So, here is a guy who drives Ferrari's and such and he thinks something is wrong with trans. due to clunking sound....
If it's NORMAL why would he hear normal as a problem???
P.S. He loves the car...
His thought: It is in the new rearend and that he thinks it feels a bit loose.
Hmmm?
We are going to rack it after Christmas and see if we can see anything or find any play!

 

[woofwoofdroolyface]

I asked about that exact point in post #800 (physics and all). The current theory is a lack of appropriate isolation in this Mustang, not that there is something broken in my car.

Lack of appropriate isolation for the given amount of movement in the rear subframe due to the overly soft differential isolation bushings my guess at this point. Solid rear axle Mustangs with the MT82 don't have this issue because there is no IRS. The fact that automatic cars can get the thud too when driven hard support this guess as well.

The Steeda or BMR inserts should fix the problem:

http://www.bmrsuspension.com/?page=products&productid=1569

http://www.steeda.com/steeda-s550-m...ing-insert-system-urethane-2015-all-555-4439/

 

[Hwy1]

Lack of appropriate isolation for the given amount of movement in the rear subframe due to the overly soft differential isolation bushings my guess at this point. Solid rear axle Mustangs with the MT82 don't have this issue because there is no IRS. The fact that automatic cars can get the thud too when driven hard support this guess as well.

The Steeda or BMR inserts should fix the problem:

http://www.bmrsuspension.com/?page=products&productid=1569

http://www.steeda.com/steeda-s550-m...ing-insert-system-urethane-2015-all-555-4439/

Best post yet.. Thx Also note: Changing out these parts may bring out some other noise's that you might not like, that is called "performance noise", friend's!

:ford:

 

[CB]

Those that have this problem might want to do a road test. Get some one that knows what they are looking for and have them follow you down a straight road and see if there is any yaw in your car.

 

[15RRGT]

Lack of appropriate isolation for the given amount of movement in the rear subframe due to the overly soft differential isolation bushings my guess at this point. Solid rear axle Mustangs with the MT82 don't have this issue because there is no IRS. The fact that automatic cars can get the thud too when driven hard support this guess as well.

The Steeda or BMR inserts should fix the problem:

http://www.bmrsuspension.com/?page=products&productid=1569

http://www.steeda.com/steeda-s550-m...ing-insert-system-urethane-2015-all-555-4439/

I just installed the steeda version. If I get the car out again before April I'll report back and let you know if they help lol.

 

[nrothaar]

Can anyone confirm these inserts fix the problem

 

[Blackbeauty]

I've been researching this to hell and seem to get the same answers of some saying it's normal and some saying that they don't know what I'm talking about. The majority saying that this normal. I've owned a 2003 GT and a 2007 GT before with the Tremecs and they never had this issue so I panicked too when I felt those thuds.

 

[mustang_guy]

Can anyone confirm these inserts fix the problem

Someone made a thread about the bmr ones fixing his. This really is not much different then the wrxs and sti. They had a klunk come from the rear end when shifted hard or launched. Companies made poly to metal bushings to fix it. The thud isnt a big deal. For people racing a lot you should change them, for the casual non racer, ignore it.

 

[Hwy1]

what we have here is Ford putting out a performance car that they wanted a smooth, clean and soft ride...
THEY DONT MIX..
It's up to us to either go big or go smooth.. I choose mods.
This car with a few mods. mentioned will become the GT you thought you were buying..
I love adding mods.
Game on...
Which means after a few bushings here and there, we will have a driveline that rocks, but could be noisier then the old rubber mounted one..

 

[mustang_guy]

what we have here is Ford putting out a performance car that they wanted a smooth, clean and soft ride...
THEY DONT MIX..
It's up to us to either go big or go smooth.. I choose mods.
This car with a few mods. mentioned will become the GT you thought you were buying..
I love adding mods.
Game on...
Which means after a few bushings here and there, we will have a driveline that rocks, but could be noisier then the old rubber mounted one..

thats what sells to the masses. We are the minority unfortunately. At least there is aftermarket fixes

 

[WeinerDog]

Can anyone confirm these inserts fix the problem

JewishThunder already mentioned the BMR kit fixed it for him. I have the Steeda kit on the way and will install ASAP. A report will be forthcoming!

 

[Knight5.0]

I have 2016 GT pp and I have BMR differential and cradle lockout kits installed. I still have it when I shift above 5500 rpm. I don't shift at that high rpm often but I also get it Every now and then when normal driving. I also have the Barton shifter installed.


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