Re: 2 post car lift
The instructions for my two post said 4 inches minimum. I have about 12 at the posts with 9 inch anchors, just because. I would cut out your floor and pour new pads, maybe 6 inches, with tie bars drilled back into existing floor. Your 3 X 3 would work or 2 X 4. Even if you buy a used one, like I did, contact the manufacturer and get THEIR instructions. It ain't rocket science.
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