Peyton, this is a really good question. We say no impact on the Scissor Jack HD because it uses a planetary gear reduction. Through much testing we have found these gear boxes love continuous loads, like those provided by a drill and hate shock loads, like those provided by an Impact. The jack may technically work with an impact, but the internal components fight each other during use. The result is it dramatically reduces the life of the jack and its effectiveness. Not only do we want the jack to work for you, but we want it to work for a very long time for you. So, that is why we say NO impacts. Don't want to leave you hanging though, so here is a bit of inside info - if you have a smaller vehicle like an F-150, Jeep or Bronco there is good news we are working on a version for those vehicles that will be impact rated. Look for that to launch in the 4th quarter.