This has probably been addressed, although I couldn't find the link. I'm looking for a Dana for a '67 & up A-body. I have maybe three to choose from. One is in a '00 3500 van. It's a 3.73 open. The other two are from the 1980s pickups. No idea on the ratio. Are all of the gear sets the same? Same bearings, etc? Thanks for any help.