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Yes, they did.
Every '98-'02 WS6 or SS car with the 4L60E auto trans was factory equiped with a 3.23 gear. The GU5 (3.23) option was manditiory with RPO WU8 (SS) or WS6 when an automatic trans (RPOs MX0 & M30) was selected.
The only way you could possibily have a gear other than 3.23 in an automatic SS or WS6 would be if someone changed it, or the unlikely event of an assembly line error.










i still got another year