there is commonly three final gear ratios that are in the bonneville i believe one of the big guys here did a technical post on it but the common one i know of spanning the 92-99 generation of bonnies are: 2.83, 3.05??? (not 100% positive on that one) and 2.93 standard on all supercharged bonnes
easest way to tell on a naturally aspirated car is go head to head with a SSEi (stock vs. stock) if you take the SSEi off the line then he smokes you after you gain a car then you probably have the 3.62 gears i know my stock SSEi get taken off the line by SE SLE and SSE(N/A) before they are out of the intersection though im half way up the side of them and climbing
this url links to specs on the 2000's but they should be really similar in older models
http://www.gmforum.com/t275685/