Hi. I own a 2020 mustang GT premium. The car is a 10 speed automatic. I have no mods done to the car other than a H-Pipe install.

I recently started hearing a knock sound when the car is going to 5th gear at low MPH.

id Relate the sound to a horse “dum dum” sound. Also like a struggle in changing gears.

Thank you for taking the time in assisting me. Much appreciated.