Pretty sure it's a GM truck 12 bolt. No tag and the cover matches a GM 12 bolt and the numbers are stamped front of passenger side right where GM would put them. It's a half ton so I doubt a dana would have been put in it. I'm just curious how the numbers decode. I know by driving it, it's a 3.73 gearing. I'm not at a point where I can pull the cover at this time. Most sites I look at address a lot of car number decoding but not truck and I can't find the THD suffix on any of them.
Last edited by bztguy; 01/04/2019 6:37 PM.
