2009 FORD MUSTANG Power Train Problems

The clutch/flywheel/ and or other components of the drive train/engine/transmission connection are faulty and are known to fail for the 2007-2009 Shelby Ford Mustang GT 500 as documented in the numerous Ford Technical Service Bullitens (TSB). This vehicle is available for inspection upon request. Late this summer (2023), I was driving this vehicle with my kids in the car and attempting to merge on the entry ramp for the expressway. I experienced a sudden loss of acceleration and the RPMs immediately "redlined". I had to pull over to the shoulder of the expressway so I would not be rear-ended. I researched this issue and found hundreds of posts on Mustang forums documenting this known issue and the TSB issued by Ford. I have reached out to Ford directly and had my vehicle inspected at a Ford Dealership. The Ford Dealership indicated the issues were consistent with the known defective parts....

SERVO ON TRANSMISSION PUSHED SNAP OUT OF RETAINING GROOVE CAUSING LOSS OF TRANSMISSION FLUID WHILE DRIVING AT SPEED.SERVO PUSHED OUT OF TRANS,CAR ACTED LIKE IT WAS IN NEUTRAL THAN LURCHED AHEAD ALMOST CAUSED AN ACCIDENT.

THE REAR DIFFERENTIAL ON MY CAR WAS LEAKING FLUID WITH LESS THAN 30,000 MILES ON THE CAR. THE 3 YEAR/36,000 MILE WARRANTY HAD EXPIRED SO I INSPECTED IT MYSELF.WHEN I REMOVED THE FILL PLUG IN THE REAREND I HEARD PRESSURE ESCAPE.THAT TOLD ME THE PRESSURE RELIEVE VALVE IN THE REAREND WAS DEFECTIVE.BUT BECAUSE OF THAT MY SEALS NEED TO BE REPLACED IN MY REAR DIFFERENTIAL NOW.AFTER TALKING TO OTHER MUSTANG OWNERS I HAVE BEEN TOLD THIS IS A COMMON AND EXPENSIVE AND DANGEROUS PROBLEM.THIS COULD CAUSE FLUID TO LEAK ONTO REAR BRAKES OR EVEN WORSE TO MUCH FLUID LOSE WOULD CAUSE THE REAR DIFFERENTIAL TO LOCK UP AND CAUSE A ACCIDENT.I MODIFIED THE RELIEF VALVE TO FIX THE PRESSURE BUILD UP PROBLEM.BUT NOW NEED TO HAVE THE SEALS REPLACED WHICH IS A EXPENSIVE REPAIR.I RARELY DRIVE MY CAR AND IT IS ALWAYS GARAGED.THAT IS HOW I NOTICED IT WAS LEAKING...

I RENTED A CAR FROM THRIFTY IN SEATTLE, AND WAS ASSIGNED AN ALMOST NEW MUSTANG. I FOUND IT EXTREMELY DIFFICULT TO BRAKE WITH MY LEFT FOOT WITHOUT ALSO HITTING THE ACCELERATOR. THE PEDALS WERE VERY CLOSE AND ALMOST SAME HEIGHT. I CONSIDERED THE CAR UNDRIVEABLE. I EXCHANGED IT ASAP, NO SURPRISE TO THRIFTY. *TR