I will ask why do this?
First a dana is more appropriate, stronger, less costly.
Sell the 9" to someone who doesn't know better then put the money into a Dana.
Stock 9" is no stronger than a 8 3/4 or 9 1/4 that dodge uses.
It can be made quite strong with all aftermarket parts but most everyone I know who change to it from a 8 3/4 or even the bow tie guys from thier 12 bolts find now they have to spend money making it as strong as what they had.