Brent Bolin wrote:
Live in the chicagoland burbs.

Specifically where the recently new(5 years) drive way meets the
garage concrete. The divider or filling (not sure what to call it) is
in pretty bad shape. Looks to me like water is getting under the
drive way and freezing. Has not cracked, just risen about 2 inches.

Is it difficult to replace this? Where would you find it?

Replace what? The concrete?

If so, break up and remove the old concrete, build a form, fill with rebar,
and have concrete delivered. Easier said than done.

Or, wait until the concrete slab settles back down (after the winter) and
replace / re-seal the areas where excessive water gets beneath the slab.