Full floater, I believe, a Dana 60 from all indications.
The local Pick & Pay had several such vans until just recently and on my last trip I saw only one. I'll have to investigate the price and removal policy. Might have to pay them to remove it for me. Good to know these axles are as common as they are. I also found this chart in my searching.
Dana 60 Rear - 30 Spline
Dana 60 Rear
• Ring Gear Diameter: 9.750
• Cover Bolts: 10
• Ring Gear Bolts: 12
• Spline Count: 30
• Dropout: False
• Pinion Support: False
• Carrier Breaks: 4.10 / 4.56
• Rear Suspension: Solid
• Pinion Nut Size: 1-5/16
Compatible with Models:
B100 Dodge Van 1/2 Ton: 1970 - 1980 (Rear)
B200 Dodge Van 3/4 Ton: 1970 - 1981 (Rear)
B250 Dodge Van 3/4 Ton: 1981 - 1994 (Rear)
B2500 Dodge Van 3/4 Ton: 1995 - 1998 (Rear)
B300 Dodge Van 1 Ton: 1970 - 1980 (Rear)
B350 Dodge Van 1 Ton: 1981 - 1994 (Rear)
B3500 Dodge Van 1 Ton: 1995 - 1998 (Rear)
C10 1/2 Ton (2WD): 1967 - 1972 (Rear)
C15/ C1500 1/2 Ton (2WD): 1967 - 1972 (Rear)
C20 3/4 Ton (2WD): 1964 - 1972 (Rear)
C25/ C2500 3/4 Ton (2WD): 1964 - 1972 (Rear)
D200 2wd 3/4 Ton: 1960 - 1980 (Rear)
D250 2wd 3/4 Ton: 1965 - 1993 (Rear)
D300 2wd 1 Ton: 1960 - 1980 (Rear)
D350 2wd 1 Ton: 1981 - 1993 (Rear)
E-250 3/4 Ton: 1980 - 2001 (Rear)
E-300 1 Ton: 1968 - 1974 (Rear)
E-350 1 Ton: 1975 - 2001 (Rear)
F-100 1/2 Ton: 1965 - 1971 (Rear)
F-100 1/2 Ton: 1965 - 1971 (Rear)
F-250 3/4 Ton: 1974 - 1986 (Rear)
F-250 3/4 Ton: 1974 - 1986 (Rear)
G30 1 Ton: 1979 - 1987 (Rear)
G35/ G3500 1 Ton: 1973 - 1978 (Rear)
K10/ K1500 1/2 Ton (4WD): 1967 - 1972 (Rear)
K15/ K1500 1/2 Ton (4WD): 1967 - 1972 (Rear)
K35/K3500 1 Ton (4WD): 1979 - 1987 (Rear)
Ram 2500 3/4 Ton: 1994 - 2002 (Rear)
Ram 2500 3/4 Ton: 1994 - 2002 (Rear)
Ram Van 2500 3/4 Ton: 1971 - 2003 (Rear)
Ram Van 3500 1 Ton: 1971 - 2003 (Rear)
Suburban 1/2 Ton: 1967 - 1972 (Rear)
Suburban 1/2 Ton: 1967 - 1972 (Rear)
Suburban 1/2 Ton: 1967 - 1972 (Rear)
Suburban 1/2 Ton: 1967 - 1972 (Rear)
Suburban 3/4 Ton: 1964 - 1972 (Rear)
Suburban 3/4 Ton: 1964 - 1972 (Rear)
W200 3/4 Ton 4x4: 1967 - 1988 (Rear)
W250 3/4 Ton 4x4: 1981 - 1993 (Rear)
W300 1 Ton 4x4: 1960 - 1980 (Rear)
W300 1 Ton 4x4: 1960 - 1980 (Rear)
W350 1 Ton 4x4: 1981 - 1993 (Rear)
Wagoneer: 1963 - 1976 (Rear)
Hard to believe that every rear axle in each of those listed vehicles would work, but that's still a helluva of a field to choose from. Bound to be one or two of them over at Pop's.