The correct way to drive on snow is not to use low gears but high gears, with low gearing its very easy to spin the wheels, once you have lost traction you will fall down the camber. In a higher gear you have a steadier power delivery and more time to react. You slow down using the engine to brake and use the brakes only for finer control. Over confident 4x4 owners are lethal in the ice, there's a hill near me that gets a few crashing every year. Have a look at snow socks, MTs are good in fresh snow but crap on ice, AT's are better and snow tyres are very good on ice, YouTube it and you will see it all...