8 3/4 A Body Just picked up

Hey Guys - now that I'm comfortable with the rear and can proceed - I need a manual to refer to. I've seen all the links and such on line here and in other areas but, nothing that really has a specific line on differentials - I'm looking for something that can guide me through complete tear down of the 741 chunk along with the posi unit. Anyone have info on what book would be best and where to get it?

Thanks.