Reputation with Darnassus

Hi everyone on Nost!
I play on Nost PVE and I've got to lvl 50 on my Human Warrior.
I'd like to get my reputation with Darnassus to exalted the smoothest way possible. I'm 6k/21k into exalted and I still haven't done the Teldrassil quests. I really want to get the oldschool looking mounts from Darnassus before 1.4 hits. Yesterday I was told that I should do the Teldrassil quests before I hit lvl 56, cuz at 56 the reputation decays. I just want to know if that's true and if theres anything else I should know? If that's the case I'm going to do the Teldrassil quests at 55. Another person told me that the reputation decays when it hits grey?
I can't donate cloth because it's not implemented yet.
Any information is useful. Cheers!
I play on Nost PVE and I've got to lvl 50 on my Human Warrior.
I'd like to get my reputation with Darnassus to exalted the smoothest way possible. I'm 6k/21k into exalted and I still haven't done the Teldrassil quests. I really want to get the oldschool looking mounts from Darnassus before 1.4 hits. Yesterday I was told that I should do the Teldrassil quests before I hit lvl 56, cuz at 56 the reputation decays. I just want to know if that's true and if theres anything else I should know? If that's the case I'm going to do the Teldrassil quests at 55. Another person told me that the reputation decays when it hits grey?
I can't donate cloth because it's not implemented yet.
Any information is useful. Cheers!