'69 Barracuda T56 swap, floor, cross member

if you weld a nut to the bottom of the diff casing then centre punch and drill inside the nut you'll be able to fully drain it easily. just screw a stubby bolt with either a copper washer or a dowty seal in to seal it up.
neil.
ps weld the nut on first, it's hard to stop the case dripping otherwise and we all know oil and welding doesn't go well together.