Pressure wash the torsion bar cross mount and the front ant rear torsion bar mounts. Blast away at the accumulation of grime-grease-grit and rust. That will enable you to do a visual inspection. If it passes that, get something like a 1/4 to 3/8 inch diameter punch with a flat on the business end and a hammer and check out the torsion bar cross member by giving it some decent hits every couple of inches.
If the punch breaks through the cross member, you know what that means.
If it does not, chances are it’s ok, you will get a better look at it with the floors out.