I got my LBZ last night with the 6 speed allison, its about an average of 35 degrees out here... going from first to second, sometimes into third it feels like it shifts hard, like it grabs the gears pretty hard, the other ones are as smooth as anything. I have 172 miles on it, picked it up from dealer last night with 100 on it. is it breaking in? or could have it been pulled with for those 100 or less miles? This is also my first ally/duramax combo, so i am not too sure what to expect.