The Infamous Differential Code Question
Thread Starter
5th Gear
Joined: Jun 2010
Posts: 5
Likes: 0
From: Holuston Texas
The Infamous Differential Code Question
why cant i find my differentials codes on any GM site, or eaton or any other for that matter. there is a 'GM' stamped right into the casting (actually protruding from casting). and during most searches i am referred to a gasket face identification chart, what the #$@%, I've got the numbers right here, lets use em! as you may have seen yourself none of these gasket face identifiers include an 8 bolt IRS style diff. the lowest bolt count i find is 10, makes me want to drink! furthermore the guy who stamped my diff. on the bottom was obviously hung-over and let the stamp bounce on the first letter which is an 'A' so there are 2 'A's overlapping eachother... im not sure if there is supposed to be 2 or 1???!!! whew! i feel better already, so there is a 'GM' with a '13' above it, also a 'G64' and 'C2' as well as the hand stamped 'AWW198E2' and as i said the 'A's are on one another so it may be 'AAWW198E2' but i doubt it. 
P.S. i know it is a 3.08, thanks to any helpers!
P.S. i know it is a 3.08, thanks to any helpers!
Instructor
Joined: Aug 2012
Posts: 160
Likes: 3
From: Bellevue Nebraska
NE Events Coordinator
I believe, from looking at several sources, that your code is broken down as follows:
AW - 3.08:1
W - Warren Michigan Plant
198 - Julian date of manufacture
E - Eaton posi-traction
2 - Shift that assembled the unit
Assuming it's a 74 from your screen name, I believe the differential cover is 8 bolt, ecklers has the gaskets http://www.ecklerscorvette.com/1974-...sket-rear.html
Hope that helps and/or is what your looking for.
AW - 3.08:1
W - Warren Michigan Plant
198 - Julian date of manufacture
E - Eaton posi-traction
2 - Shift that assembled the unit
Assuming it's a 74 from your screen name, I believe the differential cover is 8 bolt, ecklers has the gaskets http://www.ecklerscorvette.com/1974-...sket-rear.html
Hope that helps and/or is what your looking for.
Thread Starter
5th Gear
Joined: Jun 2010
Posts: 5
Likes: 0
From: Holuston Texas
Thanks, where did you get that info, i found no codes that started with an 'A' . I was initially looking for information about torque ratings and overall reputation of the rear end i.e. bearing problems, seals leaking,... just wanted to know if its worth a dang before i spend any money on it! im looking to get a 3.73 gear set and will be replacing the bearings and seals when i do that. there is a pletera of info on the 10 and 12 bolt patterns but it just frustrated me to find virtually nothing on my 8 bolt IR. and f.y.i. i would be buying the parts from Ecklers. unless anyone has a Cheper place to get the parts. You could peice together an entire Vette from Ecklers, but boy are they pricy!
Melting Slicks
Joined: Mar 2005
Posts: 2,093
Likes: 297
From: Midlothian VA
Thanks, where did you get that info, i found no codes that started with an 'A' . I was initially looking for information about torque ratings and overall reputation of the rear end i.e. bearing problems, seals leaking,... just wanted to know if its worth a dang before i spend any money on it! im looking to get a 3.73 gear set and will be replacing the bearings and seals when i do that. there is a pletera of info on the 10 and 12 bolt patterns but it just frustrated me to find virtually nothing on my 8 bolt IR. and f.y.i. i would be buying the parts from Ecklers. unless anyone has a Cheper place to get the parts. You could peice together an entire Vette from Ecklers, but boy are they pricy!Last edited by Hammerhead Fred; Sep 19, 2013 at 09:26 PM.
Instructor
Joined: Aug 2012
Posts: 160
Likes: 3
From: Bellevue Nebraska
NE Events Coordinator
Intermediate
Joined: Dec 2012
Posts: 36
Likes: 0
From: Titusville FL
I believe, from looking at several sources, that your code is broken down as follows:
AW - 3.08:1
W - Warren Michigan Plant
198 - Julian date of manufacture
E - Eaton posi-traction
2 - Shift that assembled the unit
Assuming it's a 74 from your screen name, I believe the differential cover is 8 bolt, ecklers has the gaskets http://www.ecklerscorvette.com/1974-...sket-rear.html
Hope that helps and/or is what your looking for.
AW - 3.08:1
W - Warren Michigan Plant
198 - Julian date of manufacture
E - Eaton posi-traction
2 - Shift that assembled the unit
Assuming it's a 74 from your screen name, I believe the differential cover is 8 bolt, ecklers has the gaskets http://www.ecklerscorvette.com/1974-...sket-rear.html
Hope that helps and/or is what your looking for.
Thank you very much,
Eckler's Family of Automotive Parts.
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