Brother Al, I don't mean to be picky here, but I own a 2+2. I've got the build sheet and the SPD label for the car, and both pieces of paperwork list the GU4 axle, which is the 3.08 ratio, and the G80 option, which is positraction.
I have the March 2007 issue of Hemmings Muscle Machines, where they've consulted with Pontiac Historical Services, which is a U.S. only service, and on page 42 of the magazine, the writer states "Besides the mandatory Y97 2+2 package, the vast majority of 2+2s were loaded with the following options:AU3 power door locks, AO1 tinted windows, A31 power windows, CD4 pulse wipers, C60 manual control air conditioning, D35 left-hand remote and right-hand manual-control outside rear view mirrors, FE2 ride and handling package, GU4 3.08 rear axle ratio, G80 limited slip rear axle, K34 electronic cruise control, MW9 200-4R four speed automatic overdrive transmission, NP5 leather wrapped steering wheel, N33 tilt steering column, N83 15 X 7-inch Rally II wheels, UE8 digital electric clock, UK5 AM/FM stereo with cassette, U21 instrument cluster with gauges and tachometer, and VO8 heavy duty cooling system. All 1,225 (a number procured from our friends at Pontiac Historical Services) 2+2s were silver, with charcoal rockers and a red stripe separating the colors, though a couple of cars built for executives are reported to have been painted maroon."
Maybe the cars that you've seen have been in the small minority that didn't have the 3.08 axle.
Also, in the 3rd edition of The Standard Guide to American Muscle Cars a Supercar Source Book 1960-2000, which is edited by John Gunnell, it states on page 259, "Mechanically, the LG4 305-cid Chevy small block V-8 was rated at 165 hp, up 15 from the regular 305 in the Grand Prix. A four-speed speed automatic overdrive transmission and 3.08:1 rear end gearing kept things on the calm side. Front and rear stabilizer bars, stronger shocks and 215/65R15 Goodyear Eagle GT tires firmed up the ride and handling."
Do you have any documentation that states otherwise? Just saying what I know, and what I've read.