I used the steering box out of a 97 jeep GRAND Cherokee, 3 turns lock to lock, handles great, stops are perfect, had new hoses made which I had to do anyway since I'm LS swapped. I'd never go back!
Jeep division of Chrysler uses the same Saginaw box that Chevy uses (Jeep used to buy tranies and engines from Chevy as well so there are a lot of parts that interchange even though Jeep made their own head). Additionally Ford uses Saginaw steering gear boxes on their intermediate cars.
Comes from a desire not to reinvent the wheel when there is a cheap solution to a common problem.