The 1963 rear end won the poll which means we don't have to install the 1965. And since we don't have a 1963 rear end in hand we are in no hurry to remove the 1975 that's currently installed. We can install the correct half shafts though. This is a picture of the 1975 rear end with 1975 half shafts. We will replace these half shafts with the correct smaller diameter shafts from 1963.
The swap is half done in this photo. The 1963 half shaft is on the left and the 1975 is on the right.
Here is a side-by-side comparison. Left is the 1975, right is the 1963. Universal joints are identical in size for both.
The swap is half done in this photo. The 1963 half shaft is on the left and the 1975 is on the right.
Here is a side-by-side comparison. Left is the 1975, right is the 1963. Universal joints are identical in size for both. 










