What is entailed in established packs merging & rebranding?

How do two established packs go about merging and rebranding as a new pack? Do we treat it like a relocation with three completed threads and just send a pm to all the CM's with our completed threads, new pack name, ranks & colors?

Or should we submit an app in the pack application fourm?

I know this has already been answered, but you need to post the new info in the pack application forum! Since you're already around, it's an automatic green light. If you're relocating, you do need the relocation threads.