Dark Horse Driveline Clunk

[Ike]

At about the 500-mile mark, I've developed a "clunk" sound that seems to occur around 29mph when slowing to a stop at a traffic light, etc. It seems to occur when it downshifts into 5th. The transmission shifts fine and doesn't have the gear hunting and other issues I've read about with the 10r80, but now, after reading about all the issues with this transmission, I'm concerned there may be a problem. The "clunk" does not occur when accelerating, only when decelerating.

The only harsh shifting I've experienced was one time around 300 miles in Sport mode, acclerating moderately, and then needed to hit the brakes when a dog ran in front of me, at which time it downshifted quickly, chirping the tires.

Does this sound like a transmission problem, possibly a CDF drum, or something else? I've gotten under to see if any suspension or drive shaft components are loose or show signs of hitting, but I didn't find anything. Will try to setup an appointment with the dealer this week.

Sponsored

 

[Upacurb]

As great as the 10a is…. The 10a in my previous Mustang and the one in my truck will randomly do the same thing… definitely not every time but every so often. I have 40k miles on my truck now with no big problems if that helps

 

[jimbo67]

It gets better when you get more miles on it. I have 2018 f150 with an A10 had it reprogramed it got better but shifts nowhere as nice as my GT at 3800 miles.

 

[Ford Motor Company]

At about the 500-mile mark, I've developed a "clunk" sound that seems to occur around 29mph when slowing to a stop at a traffic light, etc. It seems to occur when it downshifts into 5th. The transmission shifts fine and doesn't have the gear hunting and other issues I've read about with the 10r80, but now, after reading about all the issues with this transmission, I'm concerned there may be a problem. The "clunk" does not occur when accelerating, only when decelerating.

The only harsh shifting I've experienced was one time around 300 miles in Sport mode, acclerating moderately, and then needed to hit the brakes when a dog ran in front of me, at which time it downshifted quickly, chirping the tires.

Does this sound like a transmission problem, possibly a CDF drum, or something else? I've gotten under to see if any suspension or drive shaft components are loose or show signs of hitting, but I didn't find anything. Will try to setup an appointment with the dealer this week.

Hi there! Will you send us a message with your VIN and your local Ford dealer? I can look into things on my end.

 

[Ike]

Hi there! Will you send us a message with your VIN and your local Ford dealer? I can look into things on my end.

Thank you for your interest. I sent the requested information to you.

 

[MonsoonB8]

2024 Dark Horse with the same exact issue. 2500 miles or so. Going to dealer on Monday. Any updates on what happened with yours, by chance?

 

[RaceRedder]

As great as the 10a is…. The 10a in my previous Mustang and the one in my truck will randomly do the same thing… definitely not every time but every so often. I have 40k miles on my truck now with no big problems if that helps

If you had problems with a car at 40k it's a bad car. Common' 40k is not a mileage where you should be worried about. If so, the car is bad.

 

[LCFR]

At about the 500-mile mark, I've developed a "clunk" sound that seems to occur around 29mph when slowing to a stop at a traffic light, etc. It seems to occur when it downshifts into 5th. The transmission shifts fine and doesn't have the gear hunting and other issues I've read about with the 10r80, but now, after reading about all the issues with this transmission, I'm concerned there may be a problem. The "clunk" does not occur when accelerating, only when decelerating.

The only harsh shifting I've experienced was one time around 300 miles in Sport mode, acclerating moderately, and then needed to hit the brakes when a dog ran in front of me, at which time it downshifted quickly, chirping the tires.

Does this sound like a transmission problem, possibly a CDF drum, or something else? I've gotten under to see if any suspension or drive shaft components are loose or show signs of hitting, but I didn't find anything. Will try to setup an appointment with the dealer this week.

Same problem guys please give an update because my dealer have tried various things and none worked also there is another couple of guys with our same cars with the same issues.

 

[Ike]

Same problem guys please give an update because my dealer have tried various things and none worked also there is another couple of guys with our same cars with the same issues.

A mechanic friend of mine convinced me to wait until 1000 miles before bringing it in to the dealer, and just before 1000 miles, the clunk actually stopped, and now I have another 700 miles without this issue. I think it may be related to the transmission adaptive learning algorithm, as the only thing I changed was to stop trying the Sport mode and drive normally without any regard to "break-in".

 

[LCFR]

A mechanic friend of mine convinced me to wait until 1000 miles before bringing it in to the dealer, and just before 1000 miles, the clunk actually stopped, and now I have another 700 miles without this issue. I think it may be related to the transmission adaptive learning algorithm, as the only thing I changed was to stop trying the Sport mode and drive normally without any regard to "break-in".

Yeah I thought about that bro when I was at 800 miles then it kept on till 1200 that’s when I had to talk to the dealership, I took it in they have chnaged alot of parts on it including upper control arm, driveshaft, hub, and the probelm is still there. Now I am at 3200 miles just today and the problem is still here !! I tried to change my mechanic and try another ford dealer but they wouldn’t take the car because the first dealership changed stuff on it. Ford corportate support been useless too and all that changing was guided by their engineers. I just came to a conclusion that no one knows what they’re doing on my car rn altho I suspect that it’s a lower control arm cuz it’s when the car damp. I’ve been considering calling out lemon law, I seem not to be able to tolerate a 90k coyote with an issue it’s nuts !!

 

[Ike]

Yeah I thought about that bro when I was at 800 miles then it kept on till 1200 that’s when I had to talk to the dealership, I took it in they have chnaged alot of parts on it including upper control arm, driveshaft, hub, and the probelm is still there. Now I am at 3200 miles just today and the problem is still here !! I tried to change my mechanic and try another ford dealer but they wouldn’t take the car because the first dealership changed stuff on it. Ford corportate support been useless too and all that changing was guided by their engineers. I just came to a conclusion that no one knows what they’re doing on my car rn altho I suspect that it’s a lower control arm cuz it’s when the car damp. I’ve been considering calling out lemon law, I seem not to be able to tolerate a 90k coyote with an issue it’s nuts !!

I feel your pain. It's riduclous that it cannot be diagnosed properly. The noise mine had was unacceptable, and if it had continued or come back, it would not be tolerated. Pushing for a lemon law buyback may help push it up in priority.

 

[LCFR]

I feel your pain. It's riduclous that it cannot be diagnosed properly. The noise mine had was unacceptable, and if it had continued or come back, it would not be tolerated. Pushing for a lemon law buyback may help push it up in priority.

There are a couple of other people that I think had the same issue and it got developed to waay worse where there was some metal shredding on the wheel barrel. I’m going to try and contact him and see what happened with his mustang to try and narrow it down. One thing I’m sure of is that all of is having it in the front left wheel, coincidence ?

 

[Ike]

There are a couple of other people that I think had the same issue and it got developed to waay worse where there was some metal shredding on the wheel barrel. I’m going to try and contact him and see what happened with his mustang to try and narrow it down. One thing I’m sure of is that all of is having it in the front left wheel, coincidence ?

It must be a different issue than I was having. It was definitely not coming from the front. It was in the driveline or possibly rear suspension.

 

[LCFR]

It must be a different issue than I was having. It was definitely not coming from the front. It was in the driveline or possibly rear suspension.

I know mine too but I can tell you that I feel it every single time in the wheel a small vibration upon damping around 20-22 mph while decelerating and it has to not be chasing gears like a soft velocity change to damping so to speak and sometimes it just feels like it’s literally under you and you can feel the floor plates which gets you confused that is it under me or is it the vibration but I’m strongly confident it’s in the front left tire or I’ll be damned

 

[Magisan]

At about the 500-mile mark, I've developed a "clunk" sound that seems to occur around 29mph when slowing to a stop at a traffic light, etc. It seems to occur when it downshifts into 5th. The transmission shifts fine and doesn't have the gear hunting and other issues I've read about with the 10r80, but now, after reading about all the issues with this transmission, I'm concerned there may be a problem. The "clunk" does not occur when accelerating, only when decelerating.

The only harsh shifting I've experienced was one time around 300 miles in Sport mode, acclerating moderately, and then needed to hit the brakes when a dog ran in front of me, at which time it downshifted quickly, chirping the tires.

Does this sound like a transmission problem, possibly a CDF drum, or something else? I've gotten under to see if any suspension or drive shaft components are loose or show signs of hitting, but I didn't find anything. Will try to setup an appointment with the dealer this week.

Hey hope all is well, was there a resolution to this? Same thing is happening tomorrow Darkhorse with roughly 800 miles on it. It went away for a day then came back. Really bizarre. Just dropped it back off at dealer service. They already re tightened the entire suspension at around 400 miles when I first started getting that thunking sound.

Sponsored