differential ID 1970
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Joined: Dec 2004
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From: montgomery illinois
differential ID 1970
From what I've read there's sposed to be a stamped number depicting ratio on diff.case... but no one says exactly where.... I've got two of them still installed on rolling chassis's and can't find them, there's plenty of casting #'s but none stamped that I see, are they under a bracket or what? please help!.... Cliff
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Joined: Jun 2000
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From: Southbound
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Originally Posted by tracdogg2
Cliff,
They are stamped on the bottom edge right in front of the where the cover bolts on.
Mike
They are stamped on the bottom edge right in front of the where the cover bolts on.
Mike
You can expect to scrape off a little road gook to find the numbers unless the differential has already been cleaned up.
Race Director
Joined: Nov 1999
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From: Foxfield CO 1970 Convertible
The numbers face the ground on the lowest part of the diff. Don't look for anything boldly stamped. I had to get under there and wire brush the crud off, then really look closely. The numbers are faintly engraved into case, not raised. Oh - it doesn't show the ratio, just codes which you can decode to get the ratio. 
Drifting
Joined: Jun 2003
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From: Upstate South Carolina
Codes varied by year. They are listed in several publications including, the NCRS Judging Manual, Corvette by the Numbers, and How to Restore and Modify Your Corvette. If you have the code post it here and I or someone else can look it up.
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From: montgomery illinois
I got it
thanks guys I have two differentials both from 70's one is code cao =3:70 posi the other cav=3:08 posi the book I got at zip, 68-82 resto guide, by Richard Prince had the cao code right but had said the cav was a big block open gear 3:08 I want to thank darryl for looking up the codes in his by the #'s book which had the correct info... It's kind of blurry cause 69 and 70 are blended together, so maybe that's why prince dropped the ball, anyway, I found the codes under the mud and rust...thanks again guys
Last edited by vettemad; Jun 8, 2005 at 08:39 PM. Reason: misspell again
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