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until level 80 you shouldn't bother too much in acquiring tanking gear. As a deathknight your frost pressence should be enough to hold aggro and have the damage reduction. Aside from stamina you should look at defense rating and parry rating (although that last one is not that common).
At level 80, Frost is the tank specc. you should try to get two 1hand weapons with tanking stats and equipment with defense, parry, and dodge rating.

This is incorrect. Frost is the undergeared tanking spec however in my experiences I believe that blood outpaces it by leaps and bounds even as an undergeared tank.

For tanking you will want to go 5/5/5 + talents in whatever tree you choose. Blood is based off high stamina and survivability. Frost is mediocre for aoeing but you gain 3% avoidance. Unholy is good for aoeing but you have a little bit more to pay attention to (keeping bone armor up).


Oh, and always use a 2 hander once you get rune of stoneskin gargoyle.

unless you get outland gear at lv 69 you might as well drop the subject of tanking.

i'd go with 2 hand swords with stam then stam ench them. and focus more on stam gear you get from quests. pvp. and drops.

and try to keep your defense rating from 350-400. it's also needed.

P.S 500+ for heroics