No, I've been crawling around junkyards with a tape measure. A Dana 60 from a Dodge van and Ford van will work just fine. I've also seen other members use a 14 bolt, I have yet to find one. I was thinking about swapping out the whole undercarriage with that of a 1/2 truck also. The more I think about, I'm leaning more on staying with the 8 lugs and living with the drum brakes.
