Post by JemiS
First, go to www.Wow-Heroes.com
It will help you see what your weak spots are and what enchants/gems you are missing quickly.
Second, enchant your gear.
Third, replace these items:
Girdle of Arrogant Downfall- it's a DPS piece, get Waistguard of the Risen Knight
as a placeholder until you can find something better- or at least Tempered Saronite.
Drape of the Undefeated- it's a DPS piece, get at least the Wyrmrest Accord cloak
Those two upgrades alone are over 80 defense rating.
You should also look to replace your DPS trinket with something more tank-worthy, and get the Telderassil Protector
from the Argent Tournament Vendors. It's another +20 def rating.
If that doesn't cap you, switch your +24 stam gems to +8 defense rating/+12 stam until you can get capped without them.
But remember to get the +defense shoulder enchant from Sons of Hodir, the +37 stam/20 defense head enchant from Argent Crusade, and the +12 defense to bracer/+22 defense to chest enchants from your local enchanter.