Thanx for the input. A buddy called last night and said he has a complete
3rd member out of a '73 1/2 ton that is posi, although it has a tooth missing
on the ring gear. I'm going to do some measuring this weekend and see what
it looks kike. It will be hard to do this kind of change since the ONLY thing that
is not stock on my '55 is the 12 volt system!