Broadcast sheet question - axle

[freesaints]

I've got a 1974 Plymouth Cuda. On Line two, I'm trying to figure out axle information, particularly the size.
Axle: D56 (I understand this to be 3.55:1 rear gears for 1974)
Size: D83 (?? - on all the broadcast decoders, they have D81, D82, D84 and D85, but no D83.)

Any idea on what D83 is?

 

[rklein71]

D83 = 8.75 rear, at least that is what Google says in a few spots....