Ive read a few posts and looked at a couple of articles and just want to know one thing;

I have a totally stock ADM toyota sprinter. Using the standard rear end can i take the standard diff out and just replace it with an aftermarket diff(eg: TRD/KAAZ 2way), or do i have to replace the entire rear end? (axles, diff, tailshaft,brakes, etc)

Thanks for your time.