Thick and Ed,

Here is a blown-up/rotated crop shot of the stamped numbers that may help decide what this unit is.
Attachments
axle code.jpeg (145.13 KB, 149 downloads)
2 speed axle stamped code

~ Dan
1951 Chevy 3 window 3100
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"My Grandpa Carl's Truck and How it Became Mine"
1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver)
US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)