Super-low Gear Ratio in a 7.25” Rear End??

There was both a 2.45:1 and a 2.21:1 7¼. The cases used for these are different from the others. Both used nine bolts to secure the cover. Most 7¼ rear covers were fairly round. The cover for the two lower numeric ratios was distinctly oval shaped.

By my calculations, a 2.45:1, 255/55-16 would require 1919 rpm for 60 mph.