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.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
10 Things C8 Corvette Owners Hate (But Won't Tell You)
Joe Kucinski
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!
Brett Foote