As many of us have had this year so far, VERY cold weather. I have a 01 Silverado 5.3 with 166k. The trans fluid has been changed once its life that I am aware of, don't recall at what mileage. Seems now after sitting out all night in any temps below 15 degrees when you drive off the trans does not shift as soon as it would if it were like 25 or warmer. Seems that it wants to hold first gear longer then normal. So I drive it slow for about half a mile before it will start shift normally. Can I chalk this up to just the cold temps?