A picture of the part you wish to rebuild would help here as your description is confusing. A-body Mopars do not have steering knuckles like a solid axle vehicle. Instead they have spindles which pivot between ball joints. As for the steering column, there is no knuckle. However there is a coupling between the column shaft and the steering gearbox. That part can be rebuilt with a kit such as this http://chucker54.stores.yahoo.net/stcorekit.html