Odd option on LS6 Chevelle

[Don_Lightfoot]

I posted this on Team Chevelle a couple of years ago, but thought it would be interesting to repost on here for some input.

A local car buddy is the second owner of his LS6 that he purchased in 1973. He has GM Canada Vintage Services letter from April 25, 1994 which shows the following option:

GV2 3.08 Rear Ratio.

This was relayed to me on the phone back then so perhaps he read it wrong or I wrote it down wrong. Maybe an error from GM Canada in their notification

My understanding is they came standard with 3.31 with the only available option 4.10. I know in 1969 (perhaps other years as well) you could option down to an "economy" axle. Was this a possibility? Special order maybe? Comments appreciated.