12 bolt carrier breaks
 

Hello out there!
Looking for some help on pre- corporate 67-71 (69 specifically) 12 bolt 9-3/8 Buick rearends.
Currently have 2.56 gear ratio and looking to swap for 3.07 or 3.24. Is this possible with my existing carrier or is there a break point that a different carrier was used? Not finding much info on the 9-3/8 rearend.
Thanks in advance