Are there any number or letter markings on the rear housing. Also how would I read them ? I have a 75 coupe, 4 speed and it was listed as a 3.70 rear when I bought it. I'm not really sure that is correct. I think it was changed to a higher number rear. Any help would be greately appreciated.
Thanks, ACE
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Ace,
The code is located on the bottom of the differential carrier housing by the cover. Example: OA W2131
OA=3.08 ratio w/positraction
W=Plant
213=213th day of year
1=first shift D=day N=night
OA=3.08, LR=3.36, OB=3.55, OC=3.70
Plants...C=Buffalo,G=Chevrolet gear & axel, K=GM of Canada, W=Warren
This should do it for you..Terry in Alaska
"I Love all Corvettes! LifeTime Member #60..Terry" 
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Thanks, I'll check it out tomorrow and see what I find. Nice ride you have there also.
ACE
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