Rear Axle

Model 8 1/4
Ring Gear Diameter, Inch 8 1/4
Gear Ratios [01] 3.07, 3.55 or 4.10

Model 35 [02]
Ring Gear Diameter, Inch 7 9/16
Gear Ratios [01] 3.07, 3.55, 3.73 or 4.11

Footnotes:

[01] -- Stamped on differential housing tag.
[02] -- Dana/Spicer.