I have read here and on other sites that the 2011-2012 Mustangs have squeaky front suspensions and Dealerships are replacing bushings. I tried to tolerate the noise but it was getting worse. It actually reminded me of my very first, a 1966 Mustang, which squeaked so load you could here me 1/2 a block away. No sneaking home late as a teenager.
I took it in yesterday with my stock wheels so they couldn't later blame it on my larger wheel set. The service manager said he hasn't heard of ANY modern Mustang having bushing issues (I call B.S).
So, I get a call a few hours later and they are replacing my bushing and control arms.

 

You can add the '13's also. The Wifey's does the same from time to time. I'm just waiting for it to become constant then it's off to the shop.

 

Service writers don't get paid to display knowledge about common issues to the customer.

 

my front lower control arms was swapped out 4 times, (the last time with the C series revision), and it still squeaks and groans when going over speed bumps or small - big pot holes. It always come back after a month, and it ONLY occurs in 80 degree+ weather after driving for 20 minutes when the car is warm. Ford has NO fix and no good part that doesn't squeak like the spring of an old mattress bed, please let me know if it works out for you and what the solution is.

 

Let me get this escalated to the customer service manager for your area, guys. Please, PM me with your VIN, dealer, mileage, full name, and best daytime number so I can help.

Deysha