Looking for help w/ 7 1/4 rear end

undo the axel holding plate on the axel flange.

Then what?
I have done that and still can not get the axles out. I tried using a big slide hammer also.
I have 2.76 rear in the duster & got another 7 1/4 for free with a 3.23 in it.
It's a small bolt pattern & I'd like to pull the center section & stick it in my current to replace the 2.76 ......