Can I grow a tree from a base of a tree Sucker that's 5 feet tall?
Certified GKH Gardening Expert
As long as it is a naturally grown tree and not a graft. If this was a grafted tree then it will not produce the same fruit, or even any. But Yes, you can grow a tree from a sucker. This can be easy to do if you dig down and make sure to get some root growth. This will make things easier.
Here is a collection of articles for more information on the care of the tree: https://www.gardeningknowhow.com/edible/nut-trees/pecan/