i'm currently rebuilding a 16:1 ratio steering box for a 66 mustang that had a tag with HCC AW 6D12B. my question is the races for the 2 worm gear bearings that are in the box have a bearing under the race! The races both spin freely, but the rebuild kit races are just standard fixed races. do I leave the old races? I like the idea of them being able to freely turn (less friction) or do i just put the new fixed ones in?