Need help identifying rear axle

Crazy4elkys

Apprentice
Dec 3, 2017
68
18
Upper SC
Pick up what I think is a 8.5 rear axle today. The problem is the axle code [ACC] look at pics. Any help would be appreciated.
 

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Streetbu

Know it all, that doesn't
May 22, 2011
3,348
113
Central NY
Yeah that's not a GN axle code. No idea what it's out of.
 

79 USA 1

G-Body Guru
Sep 2, 2011
951
93
Cheektowaga, New York
Looks to be a 8.5 following the guide below.


rears.jpg


The lower control arm mount brackets look 73-77 A-Body. AC would be 2.73 ratio C would be built at Chevrolet Delevan (Buffalo NY) (6) month -June, (05) day (7) year 1977 (2) Second Shift
Below is the link to the Codes for the 73-77's.
 
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spidereyes455

G-Body Guru
Mar 6, 2013
709
93
Northeastern PA
Hope you didn't buy that as a g body rear cause that it aint. Looks like a 73-77 a body 8.5 to me
 
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spidereyes455

G-Body Guru
Mar 6, 2013
709
93
Northeastern PA
No listing in my Hollander book for an ACC code, but AC comes up as 2.73 open 8.5 1973 to 77 a body. First the shock mounts are in front of the axle someone did a rig job to put them on the rear, and it has bolt in wheel cylinders which no g body had and I believe the code is actually AC and the second C denotes Chevrolet.
 
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Crazy4elkys

Apprentice
Thread starter
Dec 3, 2017
68
18
Upper SC
I paid $200 and it posi. I think I'll be ok. The Acc code doesn't add up to me. Thanks for all the replies.
Code:
RPO           |--------Axle Code--------|
Ring Gear   Code   Ratio   Conventional   Limited Slip
-------------------------------------------------------
  7.5       G72    2.14       2AK            2BK   (aluminum brake drums)
  7.5       GH2    2.29       2AH            2BH
  7.5       GU1    2.41     2AJ,2AZ        2BJ,2BZ
  7.5       GM8    2.56       2AA            2BA
  7.5       GU2    2.73     2AB,2AX        2BB,2BX
  7.5       GU4    3.08     2AC,2AV        2BC,2BV
  7.5       GU5    3.23       2AD            2BD
  7.625     GT4    3.73       2TF            2TH   (Monte Carlo SS)
  8.5       GU6    3.42       3TP            3TJ   (T-Type, GN Std.)
  8.5       GT4    3.73     3TG,3TE        3TR,3TX (442, GN Opt.)

  8.5       GU2    2.73       8YB            8YP   (B-Body)
  8.5       GU4    3.08       8YD            8YR   (B-Body)
  8.5       GU5    3.23       8YE            8YS   (B-Body)

Hope you didn't buy that as a g body rear cause that it aint. Looks like a 73-77 a body 8.5 to me
 

spidereyes455

G-Body Guru
Mar 6, 2013
709
93
Northeastern PA
Just be warned that it is not a direct bolt in for a g body. It will be wider than a g car rear and the control arms are angled differently. That said good luck with the project.
 
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Crazy4elkys

Apprentice
Thread starter
Dec 3, 2017
68
18
Upper SC
Is it as strong as a gbody 8.5
 

Crazy4elkys

Apprentice
Thread starter
Dec 3, 2017
68
18
Upper SC
I remembered I have a gm parts manual for 1976, the year of the rear-end in question. Checked it out and the AC stands for 2.72 gears
The next C stands for plant it was manufactured in. The next numbers are the day of that year 001 and so on. Tha KS for the replys
 

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