Rear Axle Identification

[septantrionalis]

Can someone help me identify the rear axle of my 1974 Chevy K10?  I tried searching for what these identification numbers mean, but cant seem to find anything.  Would an axle like this be original on a 74 Chevy K10, or might it have been a swap?

On the front driver side, it looks like theres a "GM 55" stamped into the axle.



Above the "GM 55", there looks like a dial of some sort :



Finally, I see these identification numbers on the rear passenger side webbing.  It looks like a "CON?".  I can't make out the 4th character.  It looks like a deformed 2, but I doubt thats it.



This is a photo of the diff cover:

[blazer74]

12 bolt, should be numbers on the right axle tube front or top.

Gives original gear ratio, plant, day of year and shift assembled.

Also date code of housing on the webbing.

[blazer74]

KAH (3.07 ratio) W(warren plant) 010(10 the day of the year) 1(shift)

KAH W010 1

A(Jan) 84(8th day of 74

A84

[septantrionalis]

Thanks for the response blazer74.  I figured there was a code somewhere on the axle but I had issues finding it.  I'll try cleaning that area up more thoroughly when I get a chance.

[septantrionalis]

More photos:





It looks like

KBX W155 2 F

So I assume this is how I decode it.

KBX = Locking Differential 3.73:1
W = Warren plant
155 = 155th day
2 = Shift 2
F = ?

[septantrionalis]

E814

E = May
81st Day of 74?


Sent from my iPhone using Tapatalk

[blazer74]

The F is the posi traction source code. It could be a poorly stamped E which would be Eaton Posi.

[Sprinkler-Man]

Maybe someone could help me with my axle code. I can’t find it in any books. It’s a 12 bolt 1980 GMC High Sierra 4wd truck rear end.

Looks like TBU 278 01


Sent from my iPhone using Tapatalk

[blazer74]

TBU 3.08 ratio
278 day of the year.
01 shift
Don’t see a plant code
Actual date should be cast in the center housing near the vent tube.  (IE A84 is Jan 8  1974).



http://www.gmpartswiki.com/getbigpage?pageid=59014

https://www.crankshaftcoalition.com/wiki/Rearend_identification

[Sprinkler-Man]

Thanks


Sent from my iPhone using Tapatalk