FlaggedforHolden
Junior Member
I just purchased a 2014 Mustang GT that had a procharger already installed. The car had a bad auto transmission that I had replaced. I’ve got about 200 miles on the new transmission. Today while driving on the freeway, the car downshifted violently for no reason. It was like I slammed on the brakes. The car skidded a little and I was almost rear ended. I pulled off the freeway and the car was stuck in 1st gear. I turned it off and then back on and it ran fine. I had my tuner return the transmission tune to stock and it drove home fine. Prior to this, the transmission would seem to downshift around town or not want to go into first gear from a stop and the speedometer would go to zero or bounce up and down. My mechanic is not sure what is happening. Anyone else experience something similar and if so, did you figure out a remedy? I am not at all mechanically inclined so I am learning as I go. Thank you in advance for any advice.