I have a 2010 5.4L F-250 that has the six speed in it. I bought it used with 16k on it. Ever since I owned it, it will occasionally pop out of third gear and grind when you try to put it back in. At first I thought it was just me not pushing it up in far enough, but it's been happening a little more frequently.

Unfortunately, it's not repeatable. It happens during random temperatures and under various load conditions.

I just dread taking it to Ford, when I can't even show them the problem. It is Ford Certified so the powertrain is covered to 100k.

Does anyone have any experience or thoughts?

Thanks