I just bought a 2005 Ford Focus ZX5 January 20th it is not under a warranty well I have noticed a chirp when my transmission changes. It changes when it’s supposed to, not rough etc but it does make the chirp the car drives perfect other then that. It has 85,365 miles. I absolutely love my car but I just want to know what this is and if it’s something I should worry about. If my radio is on I rarely hear it mainly when the radio is between songs and the transmission changes other then that I don’t hear it it’s faint not loud at all. Any ideas what it could be.