World of Warcraft - How to become a champion of the factions of the horde after transferring from alliance?

I just transfered from alliance to horde and I was champion from the agrent tournament grounds for the alliance factions so now i wanted to buy mounts from the horde and it says i need to be a champion but its not giving me any quests to do to achieve this...any suggestions?|||Umm either there is diff Achievements in Each faction or your character is bugged and some achievements dinth make it through the Transfree open a ticket to the GM