2018 Ford Mustang: complete transmission failure

Filed Jul 23, 2026 · Transmission · TX

My 2018 Ford Mustang EcoBoost with the 10R80 automatic transmission began experiencing hesitation, delayed engagement, and harsh jerking during low-speed acceleration (15-20 mph), especially when cold. Engine RPM would increase, but the vehicle would hesitate before engaging. The condition worsened over time and eventually the vehicle entered limp mode, causing a significant loss of power and illuminating a wrench warning light. An authorized Ford dealership diagnosed DTC P07F6 (Gear 9 Incorrect Ratio). The dealer verified fluid level, updated the PCM, and performed adaptive relearn procedures, but the problem remained. The transmission fluid was found to be dark with a burnt odor, and the dealer diagnosed an internal transmission failure requiring complete transmission replacement at an estimated cost of $9,250. This created a safety concern because the vehicle did not consistently accelerate as expected when entering traffic, crossing intersections, or merging onto roadways. Delayed engagement and loss of power reduced the ability to accelerate when needed. The vehicle has approximately 82,256 miles and has been maintained according to Ford's recommended service schedule. I am also aware of numerous publicly documented owner reports, technical discussions, and litigation involving the Ford 10R80 transmission used in vehicles from this generation. One of the commonly discussed concerns involves the CDF drum design in earlier 10R80 transmissions. My understanding is that Ford later revised the CDF drum design in subsequent production; however, when I contacted Ford regarding this transmission failure and requested assistance with repair const, they advised that my vehicle was not covered by any recall, customer satisfaction program, or warranty extension related to this issue. I am submitting this report so that my experience can be considered together with other reports to determine whether a broader safety-related defect exists.

Filed Oct 22, 2025 · Transmission · 70,000 miles · FL

The contact owns a 2018 Ford Mustang. The contact stated that while driving at an undisclosed speed, the vehicle suddenly came to a stop while attempting to shift to second gear. The contact pulled over to the side of the road. The contact stated that the failure had been recurring while driving in second gear, which required the contact to release the accelerator pedal before the vehicle could shift to second gear. The vehicle was taken to O'Reilly’s, where it was diagnosed with transmission failure. The dealer and the manufacturer were not notified of the failure. The vehicle was not repaired. The failure mileage was approximately 70,000.

Filed Aug 11, 2025 · Transmission · NC

I have a 2018 Mustang GT with the 10R80 transmission. The transmission started giving me problems like slamming and slipping while shifting and sometimes jumping in and out of gear when drinking in the highway.The problem came from an engineering is with the CDF Drum... Ford has updated the CDF Drum and has fixed the problem. Ford never issues a recall to fix this problem with the vehicles produced with this issue but instead just used the updated production parts in the later models leaving the customers like myself to have to either pay out of pocket or rely on a warranty or after market warranty company to have this very expensive issue fixed. Right now as I am writing this, my car is in the transmission shop. Please help me. When I did a Google search of the CDF Drum issue, this is what was quoted: "The 2018 Ford Mustang GT with the 10R80 transmission can experience issues with the CDF (Clutch-Drum-Forward) drum, specifically with its bushing. This problem can lead to slippage, harsh shifting, and potential transmission failure. Ford has addressed this issue with design revisions to the CDF drum, including adding a lip to the bushing to prevent it from moving and causing fluid leaks."

Filed Jan 2, 2025 · Engine · FL

For three years, this Mustang will lurch frequently after you shift into first or reverse from park. I had it looked at Paradise Ford 3 years ago and they REFUSED to look at transmission until the car had 125k miles on it. At that time, the car only had 98k miles on it. I tried to insist, but they refused. The service helper was named Mark, I believe. The other day I was driving on a 10mph park road .....more like coasting because it was a low speed limit. The car suddenly jerked forward. Today I took it into Gary Yeoman Ford in Palm Bay, FL for a transmission check. The service advisor was Jason. They said there was a cdf hub issue and stated I needed a new transmission for 6600.00. Of course I refused and came home to research their "diagnosis". I found an article about a,10R80 bushing that has caused the same exact problem is other Mustangs. I feel like they were giving me the run around. I don't want this to cause further problems. It should have been fixed at Paradise Ford. I have owned this car for 5.5 years. I'm quite familiar with how it runs. Please advise.

Filed Jun 5, 2021 · Transmission · TN

The transmission failed while driving on a busy street making a left turn. My safety and my passenger's safety was at risk because there was oncoming traffic when I made a left turn and a car was trailing me. Just like another complaint, "10 speed transmission did not engage then failed less than a second later while pulling into an intersection. This caused the car to enter the intersection but fail to go forward more than a few feet. The problem resolved after three attempts to go forward by pumping the gas peddle. The transmission also was jerking or jumping from 1st through 3rd gear as if the car could not find the correct gear to be in while going forward. The problem resolved after the first mile of driving". However, for me the problem returned again once I turned the car off, and restarted it. After less than a mile of driving, the transmission began malfunctioning again jumping, and jerking until the transmission just stopped working altogether. Someone has posted experiencing the same malfunction on the same model and year vehicle and I wonder if there are others that have had the same scary, horrible experience? Due to my transmission malfunctioning during my turn, I was lucky that the oncoming car just stopped and blew at me, and the car behind me just went around me instead of crashing into my rear. The car was towed to the dealer and is in the process of being evaluated. There were no warning lights or messages prior to the incident and the automobile is now at the dealership because the vehicle totally stopped driving.