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Your post is a mess of spelling errors, grammar errors, and factual errors. None of those are welcome.
Making up hp by gear is not the case, DK tank is best when builded for EH tanking (effective health) due to lower avoidance (no block).
Avg DK with 10ppl gear will have about 60-65% avoidance, that's 20-25% less than warrior or Paladin, so what you have to do is stack up stamina and stamina talents, so every 1sta will give you in frost presence 11,8 (or so) hp.
Atm i have 40k hp raid buffed (in 10ppl) and about 65% avoidance also raid buffed, and i'm only gemming for stamina (or exp for threat). In this way i am very good tank on bosses like Faerlina when doing achivement, or Sartharion 3d as a main tank.
High HP pool is better choice than any other tanks stats, and that's for most DKs and DK's healers.
I was healing in TBC, and it was always better for me when i was assigned for Druid, as he had really high hp, but lower avoidance, same goes for my healers in wrath, they say dmg on me is more predictable than on avoidance tank, and so it's easier to heal me.
You want lichborn for survivability, but to be honest it's not really "oh shit button" skill, this one is not predictable, and so it's good for lowering dmg by some amount, but not for surviving critical situations.
And when you want go for Veteran of the Third War (really good talent, and often frost or unholy tank builds have it) you can boost your tps (2h weapon spec, dark confiction, bladed armor, or subversion when you are in frost), or survivability (spell deflection - great for some encounters, imp rune tap - my personal talent of choice for Sarth 3d along with spell deflection).