1998 lincoln mark viii steering wheel dont return

The first thing to do is to make sure the steering is not binding up,like a balljoint or tierod , un hook the tierods and feel the turn of the wheel at the wheel not the steering wheel, make sure its not thight do the same on the other side,also take a good look at the shaft going to steering gear,ive found that the ujoints rust up and bind,causes wheel not to return, it could also be a leaking rack internally,start there, good luck.