I was on JEGS.COM today and I happened upon something relevant to this thread. This is from a PDF instruction sheet talking about solid motor mounts:
"Solid mounts limit engine movement and make linkages operate smoother."
The category of "linkages" includes your shifter and clutch - two areas highly relevant to the problems discussed here. As I have posted many times, I think many of the problems discussed here are due to improper drivetrain alignment, and the first thing all of you with shifting problems should check is your motor / transmission mounts. The text above is the second quote related to soft mounts / shifting I have posted - both from reliable sources. Furthermore, Mustangs are well-known for excessive drivetrain play. I am not suggesting anyone switch to solid motor mounts, but I do think you need to ensure your drivetrain movement is within specs. To my knowledge, none of you have followed my advice and that is why I don't take this thread seriously at all.
Why is no one listening? I can think of two explanations: 1) some of you have already ruined your transmissions and changing the mounts won't help that 2) some of you don't like me. As far as #1 goes, all I can say is that you need to be dilligent with your dealers and bring problems to their attention early on (as opposed to complaining about them here or trying to correct them with aftermarket parts.) As for #2, I understand that alternative viewpoints are rarely popular, but I must also point out that they are often true.
The other thing I will point out is that many of you are taking a basic maintenance issue and trying to turn it into a recall. I think you are giving a great transmission a bad name, and really detracting from a positive aspect of the Mustang (the 3650), which should be praised, not criticized.