By the way, you may want to get a 3/8" "butterfly" impact.
I won't live without one of these, I have a quality one both at work and home. They "hit" as they turn breaking bolts loose. And with the butterfly you can tighten and loosen back and forth to loosen stuff up. You can turn the speed way down so they are just hitting, tap, tap, tap, tap over and over. They are AWESOME and I highly recommend picking one up.