Help Identifying Rockwell Axle

[tardis454]

My friend recently bought a 1981 GMC 7000 series 4x4 flatbed.
It has a 366 Big Block, 5spd trans, Rockwell X-fer case & front axle, Eaton rear axle.
We're trying to identify the front axle. We searched the net & found no info.
The previous owner stated it's an old Forestry service truck.
The truck was converted to 4wd (4wd on a 7000 was not a factory option)
There's a chassis builder tag on the cab (I'm waiting for a pic of that)

Here are some pics... (I'll post better pics soon)

Not a top loader style, this is what the Rockwell tag says (the ratio is 7:17!!!...)

It has the standard Rockwell 6 lug pattern, brake drums & Selectro lock-outs.

Here's the truck, 2 stick X-fer case, the levers are on the passengers side.

Anyone know what type of Rockwell axle this is?

 

[jps4jeep]

photo is not super clear, but it appears to be a rockwell axle, I believe that one would be rated at 2 ton, there is also a 5 ton that looks like that, but it would not have the hubs you showed. Rockwell build more than the 2.5 ton top loader axles that wheelers use, check out Boyce equip. that could get you the important info off the BOM numbers