I've got the newly-acquired 84 Custom Cruiser up in the air to do brakes and rear axle seals. Now, keep in mind that this car is almost a bottom-of-the-line B-body: roll-up windows, manual one piece bench seat, non-tilt steering wheel, manual door locks, cloth upholstery, etc. The only options I can see (besides PS/PDB) are A/C and cruise. Note also that this is the car with the plastic tailgate.
As I remove the rear wheels, the axle is behaving as if it is limited slip (car in park and neither wheel will turn). Naaaah! Can't be. Check the option sticker and sure enough - G80! That axle is probably worth the price of the car alone!
Every so often, you win one.