Differential Code Decoder needed
Thread Starter
Le Mans Master
Joined: Aug 2000
Posts: 6,273
Likes: 14
From: Austin TX
Differential Code Decoder needed
Help needed in decoding two differential codes:
#1 CON
C289
3899143
#2 E193
C2
3899143
Please tell me what you can about these two early 70s diffs.
thanks.
#1 CON
C289
3899143
#2 E193
C2
3899143
Please tell me what you can about these two early 70s diffs.
thanks.
Team Owner
Joined: Aug 2000
Posts: 21,457
Likes: 463
From: Massillon,Ohio USA
2020 C3 of the Year Finalist - Unmodified
Cruise-In VI Veteran
St. Jude Donor '08-'09-'10-'11-'12
None of these make sense as "ratio" codes. It appears these may be "casting date" codes.
#1 looks like possibly March 28, 1969
#2 May 19, 1973
#1 looks like possibly March 28, 1969
#2 May 19, 1973
Pro
Joined: Apr 2004
Posts: 687
Likes: 0
From: Atascadero Ca
Good date code if its May 19th (my birthday) and 1973 (my car's birthyear) 
CON
C289
3899143
Could that be CAN, 1970 3.55:1 Positraction?
That second diff i have no idea on, maybee you need to scrape some more goo off there to get clearer letters. THere should be at least 2 letters in a early diff code.
Try cleaning em up see if you can get a better look at the codes. PM or email me, my book is within reach of my computer and i'd be glad to help.
CON
C289
3899143
Could that be CAN, 1970 3.55:1 Positraction?
That second diff i have no idea on, maybee you need to scrape some more goo off there to get clearer letters. THere should be at least 2 letters in a early diff code.
Try cleaning em up see if you can get a better look at the codes. PM or email me, my book is within reach of my computer and i'd be glad to help.
Thread Starter
Le Mans Master
Joined: Aug 2000
Posts: 6,273
Likes: 14
From: Austin TX
Well, I wire brushed and checked again and I had the correct numbers in the first post.
I think the first is a 3:55 as checked by the wheel rotation vs drive shaft rotation test. However, ther is so little difference in the rotation test between a 3:55 and a 3:36 that I'm not positive.
The second is a 3:08 as verified by my mech who opened it up.
I think the first is a 3:55 as checked by the wheel rotation vs drive shaft rotation test. However, ther is so little difference in the rotation test between a 3:55 and a 3:36 that I'm not positive.
The second is a 3:08 as verified by my mech who opened it up.
