2005 acura rsx

My 2005 Acura RSX Base model makes a click noise when I shift my automatic transmission into drive
or into reverse. It just clicks once when I shift into drive or reverse. Everything is running fine, I have no
problem with my transmission shifting or making noise while driving except for that click noise. It is not
the shift solenoid that I have read in some the forums other postings. Has anyone experienced this
problem? If anyone has experienced this problem or knows about it please let me know. Thank You