Low ratio steering boxes

Have someone rock the steering wheel back and forth while you look under the hood and around the steering linkage. You should be able to see where the excess play is by doing that. Key spots to check would be any suspension bushings, the idler arm, pitman arm, tie rod ends, the steering column/steering gear coupler, and in the steering gear itself. I'd do it with the engine running as a power steering gear box tends to have more play than what you would think is normal when it's not powered. You can check the rest of the components with the engine off, but, when checking play in the box itself, have the engine running and fluid in the system.