Ah! Thanks Brian, that must be it. I remembered after writing that I had taken a look at a 1960 GMC 1/2 Ton that he has and it had trailing arms also - it was sitting right beside a '60 Chevrolet that he isn't interested in selling and they looked about the same to my eye - so I guess they were!
Thanks for all the replies!! I'm looking forward to getting this rearend and getting it in my truck - not being able to find a rearend has been the only thing really holding me back.
