6500 cat os

Team, I have a 6500 catos...with four interfaces connected to a 45xx...we now got two replacement 6500ios and we want to split two connections to each new 6500 from the old 6500catos to a port-channel group. My question is the following:

After I create my two portchannels on the new 6500ios I should have not problem unplugging the cables from the old 45xx and connecting them to the two new core 6500...looking at the configuration and reading some documentation I believe that I do not have to do anything on the old

Thanks,