My 2011 gt had this issue and ford had my car for 17 days. they gave me a revised timing cover with an added idler pulley and belt tensioner for the AC belt. Problem solved!! I haven't had the tick since.
Long story short, my tick came back, Ford admitted that they use Motorcraft XL-17 to quiet the noise. You have to go to the dealer to order it, they are usually out of stock as they use it on many Mustangs. It costs around 30 bucks or you can use Restore 4 cylinder with an oil change and that will work to quiet the noise as well.
If you have transmission issues...lol...they make a XL-19 IIRC to help with that as well. Neither will hurt your car, just make it much quieter to drive downtown unless you smash the pedal to the floor. It sucks to have people watch you because your car sounds like its bouncing tiny ball bearings around...lol.
Ford20, Dang man...is that when your engine went?