According to the folks at Snap-On, heavy-duty trucks and vans with big tires and lift kits need a jack with a higher tonnage and lift rating. The long-chassis service jacks like their 4 ton and 10 ton floor jacks can lift up to 25 inches plus. And some will have air assist so you don’t have to pump like mad to get your vehicle airborne. Jan 14, 2019 - One thing we want to note is that most floor jacks available today are. It just requires more pumps to lift your vehicle than the larger models do.
A:Tom Silva replies: A sagging floor almost always means the structure below it is sagging. In that case, it's important to know whether the sag is in the center of the room or around the edge of the room. It could either be that your foundation is drooping and your whole house is sagging, or it could mean — especially in an old house — that the floor joists have been there for a long time and gravity is pulling them own.I have to warn you that fixing a sagging floor can be expensive and difficult. If you can put a beam up with some posts from below across the center of the room, you may be able to lift the floor into place. But your floor didn't sag overnight, it sagged over many years, so you have to fix it gradually, too. If you push it up too quickly, you can cause problems on each end of the floor.
It might take a few weeks, but if the floor is built into solid structure on each end, you can push it up. Using hydraulic jacks — we typically use 20- to 40-ton jacks — push the floor up some in the morning, and wait a little while. Later on in the day, push it up a little more. A little later in the day, push it up a little more. Any time you jack or lift or try to push something back into position, you run the risk of cracking something, somewhere, so go slow. When you get the floor back into position, you just reinforce it with beams underneath.
You should probably consider seeking some professional help for this project if you decide to undertake it.