8 3/4 gear change

There's a couple good articles in Mopar Muscle online that go over the procedures very well:

http://www.moparmusclemagazine.com/techarticles/91299_closing_open_differential/
http://www.moparmusclemagazine.com/howto/155_0308_mopar_rear_end_gears_set_up/

I don't know about the coffee maker bearing method. Sounds like it would work, but you could probably also get just the bearings installed at any decent shop for not much money and complete the rest of the setup yourself.