Author Topic: Rear Axle Identification  (Read 3366 times)

Offline septantrionalis

  • Newbie
  • Posts: 49
Rear Axle Identification
« on: June 11, 2017, 08:52:29 PM »
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:


« Last Edit: June 12, 2017, 08:49:08 AM by septantrionalis »

Offline blazer74

  • Site Supporters
  • Junior Member
  • ******
  • Posts: 754
  • Newbie
Rear Axle Identification
« Reply #1 on: June 12, 2017, 12:51:03 AM »
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.

« Last Edit: June 12, 2017, 12:58:24 AM by blazer74 »

Offline blazer74

  • Site Supporters
  • Junior Member
  • ******
  • Posts: 754
  • Newbie
Re: Rear Axle Identification
« Reply #2 on: June 12, 2017, 01:08:45 AM »
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

Offline septantrionalis

  • Newbie
  • Posts: 49
Re: Rear Axle Identification
« Reply #3 on: June 12, 2017, 11:04:30 AM »
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.

Offline septantrionalis

  • Newbie
  • Posts: 49
Re: Rear Axle Identification
« Reply #4 on: June 13, 2017, 06:24:50 PM »
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 = ?
« Last Edit: June 13, 2017, 06:32:26 PM by septantrionalis »

Offline septantrionalis

  • Newbie
  • Posts: 49
Rear Axle Identification
« Reply #5 on: June 13, 2017, 07:23:31 PM »


E814

E = May
81st Day of 74?


Sent from my iPhone using Tapatalk

Offline blazer74

  • Site Supporters
  • Junior Member
  • ******
  • Posts: 754
  • Newbie
Re: Rear Axle Identification
« Reply #6 on: June 13, 2017, 09:59:20 PM »
The F is the posi traction source code. It could be a poorly stamped E which would be Eaton Posi.

Offline Sprinkler-Man

  • Newbie
  • Posts: 76
  • 80 GMC Sierra Classic 4x4
Rear Axle Identification
« Reply #7 on: May 16, 2019, 07:01:54 PM »
Maybe someone could help me with my axle code. I canít find it in any books. Itís a 12 bolt 1980 GMC High Sierra 4wd truck rear end.

Looks like TBU 278 01


Sent from my iPhone using Tapatalk
« Last Edit: May 16, 2019, 07:08:12 PM by Sprinkler-Man »

Offline blazer74

  • Site Supporters
  • Junior Member
  • ******
  • Posts: 754
  • Newbie
Re: Rear Axle Identification
« Reply #8 on: May 16, 2019, 10:37:38 PM »
TBU 3.08 ratio
278 day of the year.
01 shift
Donít 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

Offline Sprinkler-Man

  • Newbie
  • Posts: 76
  • 80 GMC Sierra Classic 4x4
Re: Rear Axle Identification
« Reply #9 on: May 17, 2019, 01:36:06 PM »
Thanks


Sent from my iPhone using Tapatalk