How do you drill out axl for 4" to 4.5" mopar rear end?

I am getting a new 8 3/4" rear end for my Duster the problem is that it's a small bolt pattern. He said that it can be drilled out to a 4.5" pattern. How do you do that? Do you have to take the studs out of the axl and re-drill new holes, with new studs??

Thanks!How do you drill out axl for 4" to 4.5" mopar rear end?
This is absolutely not a DIY project.

First off, make sure that you have a sufficiently wide flange to allow enough material on the outside of the new studs.

Then take both axles to a machine shop along with one of the original 4.5" axles and tell them what you want. If you wish, you can purchase the new studs ahead of time and bring them with you.How do you drill out axl for 4" to 4.5" mopar rear end?
A home mechanic cannot do this and considerit safe man. Im ghetto as hell but i would just get the axles man