One weak ago i change the transmission field of my CX-9 2011 , after changing when i put it in D there is click in the gear box .
I put a motorcraft Premium Automatic Transmission Fluid .
But if you are doing drain and fill only, the proper amount is about 3.3 quarts. Is your 2011 a transmission that has no dipstick? If so, search the forums for the proper way to check the level.