Since it has been colder now, lows in the 10's, highs in the 20-40s, my transmission is real hard to get into 1st or 2nd gear in the mornings. Sometimes the shift to 3rd is a bit rough, even when my transmission is warm. I'm thinking it is the cold but could it also be that I need a fluid change? I've got 67k miles over 4yrs on the factory transmission lube.