67 Fury questions....4 speed?

[RemCharger]

Dana 53 is a truck rear end

In the same fashion as a Dana 60

 

[toolmanmike]

In the same fashion as a Dana 60

9 1/4" The 9 3/4" were 60's from what I understand.

 

[RemCharger]

9 1/4" The 9 3/4" were 60's from what I understand.

A Dana 53 is a 9 1/4 and a Dana 60 is 9 3/4.
2 different axles each with their own name.