jmoore,
Looks like you're questions were misunderstood.
Here is a hemmings article on the Dana 60 that is pretty informative and tells what vehicles they were found in.

http://www.hemmings.com/mus/stories/2006/04/01/hmn_feature27.html

Also, here is a source for Dana 60 ring and pinion gears.

http://www.markwilliams.com/detail.aspx?ID=1481

Steve

'49 3800
'52 3600
'57 3100