Bricks, Masonry, Asphalt and Concrete - Replacing garage slab

I have a 2 1/2 car garage, and the concrete slab it sits on is pretty cracked and in rough shape. The structure of the garage itself is good and sound.

Are there ways to tear out and replace a garage slab without tearing down the existing garage?

Is it a structural slab on grade with the framing sitting on the slab or is it a floating slab between stem walls and the framing on the stem walls.

If it is a floating slab, you can replace it much easier.

Is the garage structure actually built on top of the slab, or is the slab poured between the walls? If the garage sits ON the slab, then it would be a lot more difficult to remove the concrete. You'd probably have to saw around the perimeter, leaving about 18 inches of the old concrete along the walls, then remove the rest. If the slab is poured between the walls, then a jackhammer (air powered, not electric) would make easy work out of removal of the entire floor without affecting the walls.

I live in Wisconsin, so I'm pretty sure it is not a floating slab.

There is a small curb that the framing sits on, and that curb is poured monolithic with the slab itself.

Around here (Minnesota), many are floating slabs with 4'+ deep stem walls because of the frost.

Just take a look at what you really have.

Pecos is right about a floating slab being much easier to replace. They are used here because you have more flexibility for drainage and have an 8" high concrete/concrete block curb that makes cleaning and washing much easier and keeps the framing out of the moisture.