My transmission is sometimes holding second gear, refusing to shift into third until I either A: let off the gas and quickly cycle the transmission into neutral and back to drive (works every time), or b: rev the engine over 4500 rpm and then let off the gas (works sometimes).
There is another component to this, it only seems to do this during extreme cold. I experienced it once on a subzero day in my old home, now I have moved further north and subzero is common this time of year.
I'm planning on changing the filter/fluid this weekend, anything else I might look for while I'm under there?