I have a current level73 warlock

[Tupacfasure]

I have been inactive since bc and only been leveling in dungeons when all raids are done on mains.
What is the best leveling spec? I get told aff and demo but can't find any info on either or the actual build

[Thafisker]

When you hit 60+ you should really just pick any specc you want to.
I leveled as Destro, was awesome
Affliction is great aswell, absolutely no downtime. With healing from your spells and mana from you pet, you actually gain hp and mana from fighting, no matter then amount of enemies.

But as I said, pick the specc you like the most, and perhaps try out the specc you count on using for lvl 80.

[Biernot]

The best spec for soloing even harder (5-man) group quests would be Felguard + Siphon Life: http://talent.mmo-champion.com/?warl...v,rQfqOe,11159
Talents in Demonology and Glyphs are chosen more defensive. This spec is also good just for normal questing and grinding

The fastest questing/grinding spec would be deep affliction: http://talent.mmo-champion.com/?warl...i,RrfqOe,11159
Some talent choices in the higher affliction tree are interchangable (Imp. Felhunter, Eradication, Imp. Howl of Terror, Death's Embrace, Dark Pact)

If you plan on doing a lot of instances, then go Destruction or have it as a secondary spec.

[Antvg]

If you carefully read the OP he says that he is leveling in instances. So answer is realy easy - destro.
http://talent.mmo-champion.com/?warl...4PpkMVZ,,11159
After that gor for demonic aegis.