A car jack is usually just a dusty, single-purpose tool, hiding in the trunk or under a seat — maybe a hydraulic bottle jack, a floor jack, or a scissor jack. You probably only pull it out when you ...

The "3/4 rule" might sound like something from a math textbook, but in fact it's a very important guideline when using one of our recommended floor jacks for DIYers. It means your floor jack should be ...