I'm not aware of any instructions specifically for what you're looking to do. Ck these out - the Ultralight Diffs for 6 gears will be closest to what you're doing. UE instructions are very detailed and illustrated so you should get the idea on what you need to do to assemble/shim your diffs.

http://www.unlimitedengineering.com/instructions.shtml

As far as the clicking - I've read a lot of times you will not find anything that looks wrong - its play/clearance related if its really the diffs. Sometimes only way is to push it til it fails. Def ck all the shafts - drive pins tend to back out, ck brgs in the wheels - one can be going bad and making noise.