2014 mustang GT breaking to a stop a loud clunk in the right rear - Mustang Evolution

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Old 04-05-2014, 02:17 AM   #1
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2014 mustang GT breaking to a stop a loud clunk in the right rear

When applying breaks 30 to 35 mph at a steady pressure the rear end will clunk when down shifting to first. It will not do it all the time but then it will start all over again. Two to three times with in a mile of city driving. What is the problem. The deanship says it is normal. But my friends say different.
What is the problem here, Transmission, ABS system or computer is not correct to regulate the speed of AUTO transmission and the engine when slowing down ?
Not happy and it has only 1600 miles.
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Old 04-05-2014, 10:19 AM   #2
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Edit....didn't see it's an auto. Anyway, stop manually shifting fir a bit and let the trans do the work for a few hundred more miles . Everything us stiff and tight right now.
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Old 04-05-2014, 11:13 AM   #3
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Not only that...I don't own an auto but 35 mph seems pretty high for a downshift to first, given the steep first gear in the auto.
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Old 04-05-2014, 09:56 PM   #4
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I have test drove new cars for a job over a few years and never had a test car clunk when breaking to a stop. Would the High RPM's of the engine relating to the Automatic transmission is not set correctly when down shifting to first gear. Would the rear control arm bushing have any do to the stopping of the car?
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Old 04-05-2014, 11:37 PM   #5
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I think you're overthinking this. 35 mph means a hard hit into first gear. You shift from second, momentarily unloading the driveline then it slams into first and ye olde driveline clunk from the multi piece drive shaft ensues.

I don't thin there's anything wrong, you're just beating on the car a bit. All this manual shifting...why didn't you buy a manual box?
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Old 04-06-2014, 01:30 AM   #6
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You guess it is a stick shift. All I do is put my foot on the break peddle and the transmission does the rest of the work it is a automatic Transmission. Just breaking normally as I have done in the past of my other 3 mustangs owned. I put on the break peddle slow and steady pressure. It will act up when going 30 to 35 mph and breaking to stop the car and the transmission down shifting in drive when breaking. It will down shift real good of all 5 gears until the 1st gear and can not hear any noise until it completely stops and then clunk!!
I do not understand it at all? It is 6 speed automatic Transmission
Thanks for your information any help be nice.
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Old 04-06-2014, 01:57 AM   #7
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I understand it's an automatic. No offense but is English your second language? It's really hard to understand your meaning and descriptions.

I guess we'll go back to advice number one. Drive it a bit more and see if it smooths out. Or go to dealer and ask to have a technician ride with you and show him.
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Old 04-06-2014, 08:04 PM   #8
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I have been two different dealerships and talked to two different District Server managers from Ford call center. Drove with two Service techs and one Service manger.


1. Car will clunk and the speed of 30 to 35 mph when the breaking and the Automatic Transmission.


2. RPM's at 700 to 800 steady break pressure on the break peddle.


3.Is it due to the ABS activating when you apply the brakes at a hard stop? Relating to the suspension settling while it is shifting in 1st gear when car is stopped per one Ford Tech at the Dealership?

4. Second Dealership disassembled rear breaks, lube slide beensand antirattle shims. Retorque all suspension fasteners to Fords Spec.


This is not an English class but I hope you understand it better.
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Old 04-06-2014, 09:13 PM   #9
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Look man, if the you want help, you need to communicate your problem clearly. It's just laziness to do otherwise. Your statements in this post are finally reasonably clear.

It will not be the abs system as that system is transparent, unless you lock a wheel.

You might jack up the car and see how much driveline slack there is in the rear and drive shaft. In park, rock the rear wheel back and forth. See how much slop is there. Then get under and twist the drive shaft the same way. If there is not much here, you can focus on an internal transmission issue or suspension noise, like sway bar links, etc., since the brakes are hopefully a ok.

See if you can find another auto gt at the dealer and drive and compare. Showing that helped me get my own transmission issue sorted.

Hope this helps
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Old 05-05-2014, 02:08 AM   #10
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Ford call center. Drove with two Service techs and one Service manger.


1. Car will clunk and the speed of 30 to 35 mph when the breaking and the Automatic Transmission.


2. RPM's at 700 to 800 steady break pressure on the break peddle.


3.Is it due to the ABS activating when you apply the brakes at a hard stop? Relating to the suspension settling while it is shifting in 1st gear when car is stopped per one Ford Tech at the Dealership?

4. Second Dealership disassembled rear breaks, lube slide beensand antirattle shims. Retorque all suspension fasteners to Fords Spec.

5. Going to the Dealership next week for the 4th time for the the same problem. What should I ask them to do?

6. Put the engine on the scope or test the engine with the laptop connected car when driving. To see how the engine and transmission are working correctly for the RPM's and speed when stopping at an intersection. Car has 1845 miles on it for the 2014 Mustang V8, 5.0.

7. Would it be wise to see how the lemon law works relating to a car with the Dealership?

8 Went to the Mustang 50th Birthday Party in Las Vegas, Nevada. It was very nice to see a lot of cars there.
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Old 05-05-2014, 08:42 AM   #11
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Has anyone looked at the traditional cause of rear clunks on S197s? Namely the sway bar end links? That could be tested by removing the sway bar and driving the car around a bit. Takes about 15 minutes under the car to pull the bar.

Again, unless you lock a wheel, ABS is transparent. It definitely hammers when applied, but that wouldn't be every stop, just ones where you will lock a brake.

When downshifting to first in D, is there any rpm flare coming out of second before it hits first? That would suggest a clutch pack or pressure modulation problem inside the trans.

Going up gears is no problem, right? Only decel, foot off gas, auto shift to 1?

Nothing wrong with weird stuff like this to put a data recorder on it and drive around to reproduce. Also, nothing wrong with informing yourself on local laws. I'd suggest, however, that the dealer is still working with you; try to keep it that way.
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Old 05-05-2014, 11:49 AM   #12
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Quote:
Originally Posted by 5LHO View Post
Has anyone looked at the traditional cause of rear clunks on S197s? Namely the sway bar end links? That could be tested by removing the sway bar and driving the car around a bit. Takes about 15 minutes under the car to pull the bar.

Again, unless you lock a wheel, ABS is transparent. It definitely hammers when applied, but that wouldn't be every stop, just ones where you will lock a brake.

When downshifting to first in D, is there any rpm flare coming out of second before it hits first? That would suggest a clutch pack or pressure modulation problem inside the trans.

Going up gears is no problem, right? Only decel, foot off gas, auto shift to 1?

Nothing wrong with weird stuff like this to put a data recorder on it and drive around to reproduce. Also, nothing wrong with informing yourself on local laws. I'd suggest, however, that the dealer is still working with you; try to keep it that way.
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Old 05-05-2014, 12:18 PM   #13
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I have the same problem. Pleas let me know how you fixed it.
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Old 05-05-2014, 03:53 PM   #14
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????
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Old 05-05-2014, 07:48 PM   #15
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I have this on my 14' v6 except it happens at about 10 mph when coming to a stop. It's pretty faint though so I just ignore it.
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