Axle Help

[highwaydevil]

I'm asking this for Plum72, his computer is down. He has a 72 shortbed sidestep 2wd. He blew the spider gears out of the rear-end, and called around for new ones. The chevy dealer told him that on a leaf-spring option truck, they didn't come with a 12 bolt rear-end, but should have a Dana 60 instead. What he needs to know is how for sure to tell he has a 12-bolt or a Dana? Here's some numbers that may help. He has the G70 leaf spring option, the truck came with a granny 4-speed, 250 engine. Code stamped on the axle is:3896839, The vin# is:ccs142j119701. He's also wondering if anyone has a new/used set of spider gears for a posi, since he's been told he has to now buy the entire unit. He's got 4:11 gears. Sorry so long. Thanks.