Personally as far as stopping power, the rears wont do much at all as the fronts will. Secondly...discs are much easier to work on. So if I wanted to convert mine from drums to discs...I would in a new York minute. All I need to do is get the rear axle assy with all the brakes **** on it from the LTZ's and yank mine out and put the other in and whala lol. Third..im not sure why GM is still doing this drum brake **** to begin with. I would of thought they do away with that long ago.