Are all 727 BB trans. from 68 to 71 interchangeable?

Would a 727 BB transmission from 1969 4 door fit in a 71 cuda ? Is there any tail shaft length differences?

If it a big block 727 in the 4-door, it should go right in your 71 Cuda. You will have to have the 71 cuda transmission mount.

71 A-727 trans had part-throttle kickdown. That will not be on the 68 trans.

70 and up automatics had an ear cast in for column shift linkage brackets. 69 and back did not have the casting.