removing spider gears 7.25

I understand that some vehicles in the '80's Had 7 1/4's that were different than the earlier ones. I have never seen one in person as far as I know.
I'm pretty sure that the Chrysler Fifth Avenue cars had a weird version of the 7 1/4" axle. It had 3" axle tubes, 10" drum brakes and crazy tall gears, like a 2.21 or something close to it. The Diplomat and Gran Fury shared the same body style but the Police cars in those models used an 8 1/4.