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The A4's came with 2.59's, with the 3.07 optional.
You can verify the ratio by checking the bottom of the diff case. It should be stamped, along with the date installed, etc.
__________________ 1996 LT4 Coupe -- Arctic White over Black 324 RWHP / 325 RWTq
K&N Filter - Open Lid
Exotic Muscle Longtube Headers
Random Technologies Bullet Cats
R-D Racing Camber Brace
Big Mouth Air Dam
Lowered Front/Rear 1"
MOMO Race Aluminum Shiftknob
TB Coolant Bypass
Grand Sport A-molds / Firestone Firehawk Wide Ovals
My '92 6 speed LT1 came with 3.54 gears FROM THE FACTORY. The RPO code is GH0. I don't know what years that GH0 was an option, but it was available in 1992. By the way, mine is a US car, so this was not some export-only option.
Unfortunately I don't have access to my C4 Corvette Specs book, but it has all this kind of information.