No duallys, those GM mini trucks axles are just a nice short length.
Lightest rear end that withstands the torque is always best.
Good grab if u have them around. Plentiful, cheap with ideal ratios high/mid/low 3s : 1 . Both mine free
Ditto DSM rear disc/caliper/cable. Make a bracket

full size chevy truck diffs from that era ALWAYS fail tho. Weird