Got my first G body just before Thanksgiving... A 1987 Oldsmobile Cutlass Supreme...Vin # says it was originally a V6 but it now has a GM 350 Crate with a TCI turbo 400 full manual trans, Edelbrock 600 cfm, Edelbrock intake, Lunati voodoo cam, Schoenfeld headers, Auto Meter liquid filled gauges, Hurst quarter stick, Hotchkis front and rear red stabalizer/sway bars and Bilstein shocks,dual Flowmasters exiting together on passenger side... Buckets out of a 86 Grand National. Thanks to this forum I was able to identify my vehicle as having a 7.5 10 bolt with 3:23 gearing, it works for now but I will try and locate a 8.5 in the future...I almost get 13mpg if I just use 2nd and 3rd gear only, 8 to 10mpg if I drive it like in high school...I'm a senior citizen and I drive it for the fun of it...it's real fast and it's really loud. I have a 4cyl. 30+mpg Hyundai Sonata for those occasional long trips to Honolulu in bumper to bumper traffic, but this is my daily driver, Old School, no computer, just gas and spark...I Love it!!!