Need help on differential date code
Thread Starter
Melting Slicks
Joined: Nov 2002
Posts: 2,460
Likes: 5
From: Wheaton IL
Need help on differential date code
Hello I'm visiting from the C2 forum.
I purchased a differential and the date code is AB W 22 5 1
AB = 3.73 Posi
I'm thinking this is a 1975 case built on the 22nd of a given month but the W has me confused.
What do you think?
Here's a pic:
Thanks,
brian
I purchased a differential and the date code is AB W 22 5 1
AB = 3.73 Posi
I'm thinking this is a 1975 case built on the 22nd of a given month but the W has me confused.
What do you think?
Here's a pic:
Thanks,
brian
Tech Contributor
Joined: Aug 1999
Posts: 15,174
Likes: 3,983
From: Connecticut, USA
Check the casting date on the LH side under the yoke.The stamped assembly date should be a couple of months later.
Look at the posi case, if it has the small sq window then it's a 65 but the stamping on a 1965 would be "65" the tear drop windows are the later units. If it's an original diff then the yokes are probably junk, same with the clutches. Check to be sure there is still a 1/8 boss on the yoke seal area.
Note AB = 370 373 were never a corvette ratio, only aftermarket or maybe a counter replacement in HP parts catalog.
Look at the posi case, if it has the small sq window then it's a 65 but the stamping on a 1965 would be "65" the tear drop windows are the later units. If it's an original diff then the yokes are probably junk, same with the clutches. Check to be sure there is still a 1/8 boss on the yoke seal area.
Note AB = 370 373 were never a corvette ratio, only aftermarket or maybe a counter replacement in HP parts catalog.
