I have 1955-- 1967 or 8 had the ram power assisted ram.
www.truckandcarshop.com has the new ram and bushings and parts.In 1968 they went to the box.If your having a looseness Its the manual box that whore out.You need to find a used box or buy a new one that will fix the looseness.The Ram is only there to make it easier on steering.