A-833 2.47 1st gear change to 3.09
Is it possible to convert my VIN stamped case and put 3.08, 1.92, 1.40, 1.00 gears in place of the 1973 OEM gears? Is this limited to swapping 1st? What parts? Cluster Gear ?
I would find a complete gearset and swap all gears and the cluster. This includes the reverse idler.
When I had my A833OD apart a couple of months ago, I thought about swapping the 1/2 slider with another one I had and after some limited reading decided that the one I had and the spare were potentially different. There are markings, notches in the points of the gears and such, that lead me to believe they were different. Because I couldn't verify the reverse gears and idler would mess fine, I left things alone.
Thus, I would keep everything together. You will have less chance of an issue doing it this way.