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I second Schurkey's advice.Does it leak? Reseal it, and flush the fluid.
Is the steering sloppy? Replace the rag joint, (preferably with a U-jointed steering shaft) then perform the two steering-gear adjustments. Then flush the fluid.
Unless there's something seriously wrong with the box you have...it's probably better than the parts-store "rebuilts" or Chinese "new" replacements.