Interchange question

Dana67Dart said

66 to 76 valiant, dart, and up to 69(IIRC) barracuda are all interchangeable.
If it was originally a slant 6, 273 2bbl ,318 2bbl it would be a 7 1/4, 340, 383 would be 8 3/4, 440 it would be dana 60. Later years some time in the early 70s had a 8 1/4,

The cars fender tag will have a code that will tell you what it originally came with

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8-3/4's in A-Body's were used from 66-72, after that they went to the 8-1/4. No Dana's were ever used in an A-Body except the 68 Hemi Dart and Barracuda which would have a B-Body Dana on 4-speed cars only. There were axle codes on 66-68 A-body's but not from 69-72. The A-Body 8-3/4 are all small bolt, 5 on 4" bolt circle but aftermarket axles can be bought.