"I think only the 1/2 ton came with the 8 3/4. The 3/4 ton had the Dana."
I must respectfully disagree. Most 3/4-ton trucks and vans had the Chrysler 9-1/4" diff. Some 3/4-ton trucks may have had the Dana 60; I'm not sure. The 1-ton trucks generally had the Dana 70.
