2013 Shelby GT500 Coupe, Triple Black
That's a good question. According to the concrete company that poured a section of sidewalk and a hot tub pad for me, the norm in this area is 4" thick 4000psi concrete. With that in mind, along with the fact that a 4-post lift distributes the weight of the car + lift over an area greater than the car's 4 wheels normally do, I wasn't concerned when adding mine. A couple of years later, I have yet to experience any problems, including cracking.With the Direct Lift, did you have to check your concrete thickness?