That's was my thinking; I have an ingersol rand 1/2" air wrench I got around 1975, it looked old then and the drive is still nice and square. I had never thought about the drives.On an impact wrench, I’d say yes as that’s the part that does all the work. If you’ve mullered the square drive then the rest is likely to be shot too...I’ve seen ancient impact wrenches and the square drive is ok so I’m unsure how you could badly screw one up?