Just wanted to let everyone know as I wasn't able to find it anywhere that when changing grand companies you lose your pvp rank BUT you do keep all your wolf marks. Verified this yesterday as my brother switched to my grand company to get ready for front lines.

Really sucks that you lose pvp rank as they tie it to GC but at least wolf marks are not like seals and you don't have to spend them before you make the switch. Hope this helped some people.