Manual Trans. Thud when shifting

[skytop1]

In a Car & Driver 40,000 mile update article, they also experience the thud and state it is very objectionable.

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[Varekai]

The thud is from the two piece drive shaft. Went away when I put in a one piece in my GT. My 350 has the same two piece shaft and it has the thud.

 

[RubyRed15]

In a Car & Driver 40,000 mile update article, they also experience the thud and state it is very objectionable.

Well clearly those morons at C&D are just on the GM payroll and they also don't know what they're talking about.

 

[camobob]

The thud is from the two piece drive shaft. Went away when I put in a one piece in my GT. My 350 has the same two piece shaft and it has the thud.

I've read this before. Also read about people who changed to a one piece and still had the thud. Mine sound like the differential but the dealer mechanic is convinced it's in the tranny. Maybe it's different depending where the play is on a given car.

 

[Kong76]

My thud is damn beer gone with Steeda engine mounts. You mileage may vary.

Any problems go away with beer... ha

This is interesting, I was just looking at my stock mounts the other day and noticed they are very black ontop like fluid or burnt. Driver side about twice as much as the passenger.

Definitely not isolated case Ford Service. Mine is actually getting worse. Its on the back burner for other issues I need my dealer to look at. $33k car thats going to need every bit of that warranty I can forsee.

 

[abmobil]

I believe the Thud is normal. My 17 GT does it. Has since day one. Currently 1800 miles on car. Very different Vehicle, but my 95 V6 manual trans Nissan Pickup does it as well. If only the MT82 felt as good as my 227k Nissan transmission.

Some say it's the 2 piece drive shaft. How can that be if it happens when the car is completely stopped?

 

[Hinds90]

I've tried to just learn to live with it. It just seems to me the driveline has so much slack in it. Like say in a parking lot in first gear even slightly getting on and off the gas there's a lot of clunks and driveline noise.

 

[skytop1]

It is NOT the drive two piece drive shaft.
It is a combination of the rear end sub chassis and rear end shifting slightly against the main chassis. That is why the clunk thump is such a low frequency sounding noise.
While standing still, I can depress the clutch and rapidly shift between gears. Each time I enter another gear, THUD! Six gear shifts, six thuds. I am approaching 10,000 miles now I have never become used to it or accepting of it. The problem and aggravating noise persists. I read owners of the 2017 also have the thud and the GT350 cars have it too.

I am pretty sure I am moving away from Ford for my next car. I am very disappointment by the total lack of support from Ford with this problem and their lack of providing a fix for a production wide manual shift Mustang defect.

 

[Hinds90]

I agree. The driveline has been a total disappointment for me.

 

[mustang_guy]

It is NOT the drive two piece drive shaft.
It is a combination of the rear end sub chassis and rear end shifting slightly against the main chassis. That is why the clunk thump is such a low frequency sounding noise.
While standing still, I can depress the clutch and rapidly shift between gears. Each time I enter another gear, THUD! Six gear shifts, six thuds. I am approaching 10,000 miles now I have never become used to it or accepting of it. The problem and aggravating noise persists. I read owners of the 2017 also have the thud and the GT350 cars have it too.

I am pretty sure I am moving away from Ford for my next car. I am very disappointment by the total lack of support from Ford with this problem and their lack of providing a fix for a production wide manual shift Mustang defect.

Its mostly related to the PP diff in the cars. My 17 doesnt have it. I also didnt buy a PP. Ive still yet to read any non pp owners complain. Ive also told you that this isnt an uncommom thing on IRS equipped vehicles. I also dont see any autos complaining about it either. You just want to complain, in my opinion.

 

[Tony Alonso]

Its mostly related to the PP diff in the cars. My 17 doesnt have it. I also didnt buy a PP. Ive still yet to read any non pp owners complain.

It's been a characteristic of my '15 GT without a performance pack since the first week I got the car back in November, 2014. I am used to driveline slop from the live axle days, so I haven't done anything about it.

 

[mustang_guy]

It's been a characteristic of my '15 GT without a performance pack since the first week I got the car back in November, 2014. I am used to driveline slop from the live axle days, so I haven't done anything about it.

Interesting! I generally hear of no one having that complaint than the vast majority of PP owners. From what ive seen on inspection on a lift (ex ford master tech here) my buddies PP it was the torsen. Id wager if your trak lok is doing it possibly just needs an adjustment. Have you ever tried taking it in? What gear ratio do you have?

 

[mustang_guy]

I didnt see many older mustangs thud like some discribe during normal driving unless you no lift shifted or banged it hard enough. Is that what you're reffering to?

 

[Tony Alonso]

Interesting! I generally hear of no one having that complaint than the vast majority of PP owners. From what ive seen on inspection on a lift (ex ford master tech here) my buddies PP it was the torsen. Id wager if your trak lok is doing it possibly just needs an adjustment. Have you ever tried taking it in? What gear ratio do you have?

It's the 3.55 gear. I've not taken it in because many of the early posts in this massive thread have centered on cushy bushings in the IRS and the IRS cradle shifting. I really didn't want to get into any diagnosis or purchase aftermarket parts to modify my daily transportation. It only occasionally shows up, or at least I don't notice it as much.

 

[Tony Alonso]

I didnt see many older mustangs thud like some discribe during normal driving unless you no lift shifted or banged it hard enough. Is that what you're reffering to?

I heard noise when shifting hard. I don't do that much these days. :-)

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