Thanks Cap!!
The SPID is missing from the glovebox door but I am hoping that the build sheet (can see it stuck under seat, but its been wet) will have some info on it thats still readable. I do have a differential service on the short list of things to do, hoping the tag is there or that I can see the R&P for counting teeth. Doesn't feel like its as low as 4.57, but I guess it could be. Will post that info when I figure it out.
Thanks for the replies folks.....this won't be an expensive build or a resto, but I have some specific ideas for this truck and will definitely post as many pics as I can.
TC