The 3.55 ring and pinion should be installed (or at least strongly considered to be installed) with the matching bearing/bushing/installation kit from Patrick's. The Okie bushing comes in that set (I do not think that he provides an original bearing/bushing and seal, but I could be wrong).

Maybe Sweet will post a link to the excellent photo-log he made of his 3.55 conversion.

Patrick's provides a pretty good instruction booklet but it has awful photos and a few omissions. You should also get a Shop manual for the year of your rear-end. The tools (mostly measurement devices) can be cheaply bought at Harbor Freight.