ZL1 rear diff arrived at the end of the week. This thing is stout and lil bigger that I thought it would be. Still trying to figure out if I wanna do a bolt-in tubular rear crossmember which will mount the rear diff and lower control arm brackets. Or do a permanent weld-in sheet metal assembly thats fully boxed in. Hopefully I'll get dimensions of the zl1 rear diff and have something figured out by the end of week so I can get back to making progress on this truck.