It's called 2nd gear nibble, at least that's what the tech at AP told me when I called and ask about it. This is not uncommon in a new T56 Magnum. My T56 did the same thing when new and I asked the same question. I was told it gets better as the transmission breaks in. It does. I have around 10,000 miles now on my new Magnum and the shifting is dramatically improved. I still get a very slight 2nd gear nibble when I first start driving each day but once the transmission comes up to temp the nibble goes away. The only thing I would recommend is that you service the transmission with new ATF somewhere between 2000 to 3000 miles.