IF YOU HAVE IT OUT TAKE OFF THE COVER-THE PREVIOUS OWNER COULD OF CHANGED THEM ALREADY.
rear end ratio
Thread Starter
Racer
Joined: Apr 2007
Posts: 492
Likes: 3
From: Temecula CA
rear end ratio
I dropped the rear end out of my 72 today. On the outside of the case, is the ratio stamped or can you decode the gear ratio from the serial number?
Temvette72
P.S. I turned the pinion and counted the rotations, and I think it is a 3.55, but I suppose it maybe could be a 3.70
Temvette72
P.S. I turned the pinion and counted the rotations, and I think it is a 3.55, but I suppose it maybe could be a 3.70
Safety Car
Joined: Sep 2007
Posts: 4,458
Likes: 331
From: Indy Indiana
look on the underside of the case and post the numbers you see there stamped on the bottom..
also on the side of the case you will see numbers cast also, post all those numbers also and we can let you know what you have...
also on the side of the case you will see numbers cast also, post all those numbers also and we can let you know what you have...
Safety Car
Joined: Oct 1999
Posts: 4,409
Likes: 1,280
From: Florida
the rear end code is 2 letters...you can find the 1972 rear end codes here:
http://corvette-world.com/corvette_1...tification.php
http://corvette-world.com/corvette_1...tification.php
Last edited by papawana; Mar 31, 2009 at 02:03 PM. Reason: typo
Racer
Joined: Apr 2008
Posts: 254
Likes: 5
From: ingleside illinois
Safety Car
Joined: Oct 2006
Posts: 3,993
Likes: 9
From: Gig Harbor WA
the rear end code is 3 letters...you can find the 1972 rear end codes here:
http://corvette-world.com/corvette_1...tification.php
http://corvette-world.com/corvette_1...tification.php
Thanks.
Tech Contributor
Joined: Aug 1999
Posts: 15,160
Likes: 3,965
From: Connecticut, USA
remove the cover, look at the side of the RG. If original they will be GM stamped and have tooth count and date stamped in. If they're aftermarket, you may see a double DD (richmond) G in a shield(US Gear) or nothing(usually imported)
Check the endplay and case as well
Check the endplay and case as well
Safety Car
Joined: Oct 1999
Posts: 4,409
Likes: 1,280
From: Florida
rear end
in 1972 there was an 8-digit code located on the bottom of the differential carrier housing just forward of the rear end cover...the first 2 letters is the factory installed ratio...there was no 3.08...AA is 3.55...AB is 3.70...AC is 4.11...AX & LR are 3.36...this info is straight out of Corvette by the Numbers by Alan Colvin
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Thread Starter
Racer
Joined: Apr 2007
Posts: 492
Likes: 3
From: Temecula CA
Well, I pulled the cover off today, and counted the teeth. I came up with 3.36 ratio. The poster who mentioned that the ratio could've been changed brought up a valid point. Anyway, so much for me counting revolutions with any accuracy!!!
Temvette72
Temvette72
