Hydraulic jacks and screw jacks serve the same basic purpose, allowing mechanics to lift and support heavy loads in the shop. That said, there are some pretty major differences in how they work, the ...

The ActionJac self-contained screw jacks from Nook Industries, Cleveland, Ohio, are totally mechanical, so there are no hydraulic hoses to crimp and maintain and no hazardous fluids that can leak.

If you are reading Four Wheeler, you probably aren’t the kind of guy (or gal) who calls AAA when you get a flat. And that is assuming that a tow truck could even get to where you are wheeling anyway.