The thread that you linked is more addressing just the shifting issue. I believe my issues with shifting stems with my issue of the clutch not returning and clutch hanging issues. Maybe hydraulic? Idk the dealership I took it to says all they can do is replace the clutch as they can find that is what Ford says and hope for the best with no promises. Not really what I am wanting to hear.
(11.)2012 GT500 silver with red stripe, SVT performance package, and Recaro seats.
2018 Honda Civic Type R
Past Mustangs in order and color of text.
(1.)2000, (2.)2004, (3.)2006GT/Auto traded for (4.)2006GT/Manual, (5.)1996, (6.)2011GT, (7.)2003GT, (8.)2006GT, (9)2013 Boss 302, and (10.) 2002GT
(I have owned a few non Mustang cars over the years as well, but always try to have a Mustang with it or come quickly back to a Mustang!)