Clunk when letting out clutch!!

Randy 25

New Member
Jun 29, 2008
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I've driven sticks most of my long life. My brand new 08 stang, only have 400 miles so far. Pretty loud clunk whenever I let the clutch out, especially hear in in 2nd and 3rd gears. Sounds like play in the drive shaft. Doesn't sound like something I should hear on brand new car. As this is my first Mustang, any ideas what it might be? Is this common? (It did sit on a lot for a year looking for a buyer.) Tx.
 
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I have an 07 I bought recently with 14k miles. I hear alot of clunking and stuff at lower speeds. Sometimes it sounds like the clutch engaging with a clunk, sometimes it sounds like maybe it's from the rear. Not really loud, but definately noticable. Not really sure what it is, but it is disappointing.


I'd really like to meet up with some owners in my area and get an idea of what is normal.
 
How loud is it? The transmission in these cars is notoriously noisey/clunky/rattly/crappy, so you may just be hearing internal noise in the trans. But if it is loud enough to cause alarm, it has 400 miles, it MUST be under warranty, take it in and have a technician listen to it, he'll be able to tell you way more than a bunch of people online who can't hear it.
 
As mentioned, the driveshaft is crap, but some clunk comes from the upper control arm mount: the hole for it is bigger than the bolt so it clunks. Smooth shifting at part throttle driving and a little practice and it's barely noticeable. When I first got mine, it was really annoying.
 
As mentioned, the driveshaft is crap, but some clunk comes from the upper control arm mount: the hole for it is bigger than the bolt so it clunks. Smooth shifting at part throttle driving and a little practice and it's barely noticeable. When I first got mine, it was really annoying.
I agree. I mostly notice it on low speed/rpm changes where I can feel the weight transfer of being in a gear, N, then upshifting. Not so much on downshifting when I come to a stop though.
 
Yes, of course it's under warranty, it's only a month old, hence only 400 miles. I just didn't want to to running back to the dealership at only 400 miles if this was something that all Mustangs did, as this is my first Mustang.

MustangDave - about the upper control arm hole larger than the bolt?? Can't believe Ford or any manufacturer would build something like that - why would they build in a for-certain "clunk"? (Not saying it isn't.) However, as you said, If I am really careful about matching revs and speed, no clunk. Just seems strange.
 
The factory upper control arm uses a very large rubber bushing to isolate drivetrain noises. I really doubt it is your upper control arm that is making the noise unless it is just loose. Our shop car also made noise new from factory due to excessive backlash in the rear-end. I would take it into Ford to have it looked at since the factory rubber bushings in the suspension should absorb most of the sounds from the drivetrain.
 
The factory upper control arm uses a very large rubber bushing to isolate drivetrain noises. I really doubt it is your upper control arm that is making the noise unless it is just loose. Our shop car also made noise new from factory due to excessive backlash in the rear-end. I would take it into Ford to have it looked at since the factory rubber bushings in the suspension should absorb most of the sounds from the drivetrain.

Thanks for the info, especially coming from someone who makes stuff for these cars. You've probably seen and heard many instances of this sort. :nice:
 
I have the same noise in my '09 GT. Feels like a whole lotta driveline lash and sounds like and old worn out U-Joint.
Other gripes:
The dash panel closest to the windshield rattles like bolts in a bucket near the L/H A pillar
The door lock surround on the driver's side pops off all the time. Glued it back in. Hope it holds
Seatbelt was installed twisted. Fiddled with it and guess I will have to add it to the punch list.

I am beginning to think my return to mother Ford was premature.
 
I have the same noise in my '09 GT. Feels like a whole lotta driveline lash and sounds like and old worn out U-Joint.
Other gripes:
The dash panel closest to the windshield rattles like bolts in a bucket near the L/H A pillar
The door lock surround on the driver's side pops off all the time. Glued it back in. Hope it holds
Seatbelt was installed twisted. Fiddled with it and guess I will have to add it to the punch list.

I am beginning to think my return to mother Ford was premature.



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Mine feels like excessive driveline lash as well. Shifting early to second under 2K is horrible sounding.
 
okay, mine does this too. I just figured it was part of a RWD + V8 set-up, and have learned to drive the car differently. What can be done if we are out of warrantee? Will any of these help: upper control arm, lower control arms, 4.10 gears, one piece driveshaft? How do I reduce backlash in the rear end?
 
okay, mine does this too. I just figured it was part of a RWD + V8 set-up, and have learned to drive the car differently. What can be done if we are out of warrantee? Will any of these help: upper control arm, lower control arms, 4.10 gears, one piece driveshaft? How do I reduce backlash in the rear end?
This is not normal for a run of the mill rwd v8 car, I've had lots, never heard this before. Mine is not rear end or trans, has to be driveline slop. Also sounds common among Mustang owners. Why in the world do we have two-piece driveshafts, especially with it being so short? They have made millions of rwd cars over the last 35 years with one piece driveshafts and no problem. Why go and change it and muck things up that is proven to work?
 
The factory upper control arm uses a very large rubber bushing to isolate drivetrain noises. I really doubt it is your upper control arm that is making the noise unless it is just loose. Our shop car also made noise new from factory due to excessive backlash in the rear-end. I would take it into Ford to have it looked at since the factory rubber bushings in the suspension should absorb most of the sounds from the drivetrain.

This was a great tip. My ring, pinion and clutches were all replaced under warranty due to excessive backlash/wear. I'm not getting a clunk every time I let the clutch out now.