Loose steering wheel shaft on 97 EXP. when I hit a bump i get the death wobble I checked everything else and and so did pep boys, tire discounters and bob somerell Tires,all is good. Has anyone had this happen and was it in the steering shaft that caused the problem

Hello, Sir is your 1997 Ford Expedition a 4X4? It sounds like the drag line and it's ball joints.
There is a bent heavy steel arm at the end of steering box. On the end of this pitman arm is the drag link and the drag link is hook to each front hub with a ball joint on each end and the pitman arm. This way when the steering wheel is turning both wheels in the front will follow each other.
If the ball joint are wore out on the drag link this will cause the front wheels to wobble.

Need to get the Ford Exp off the ground where the front wheels are free of a load. Now, just grab one of the front wheels and move it back and forth. There a good possiblity it rattle like marble in a car.
Also, check the upper and lower control arms that attached to each front hub. There are hugh ball joint in each control arm, upper and lower on each of the Ford Exp. Two per side four all together.
I hope this help you. GB...stewbison