I've been concerned by the lack of a Feral tanking weapon, and undertook an exercise to design one (same ilvl as the Stanchion) based what the best known ilvl calculations.
The result is what follows:
Mace of Feral Tankage
Binds when picked up
Two-Hand Mace
136.5 - 305.5 Damage Speed 3.00
(73.7 damage per second)
525 Armor
+112 Stamina
+50 Agility
Durability 120 / 120
Requires Level 70
Equip: Increases attack power by 1197 in Cat, Bear, Dire Bear, and Moonkin forms only.
Equip: Increases defense rating by 10.
Equip: Improves your expertise rating by 25.
Explanation:
Swapped 350 Armor Penetration for 525 Armor (350*.15/.1 = 525)
Swapped Agility for Stamina (no effect on ilvl, stamina goes to 112, Agility to 33)
Swapped 47 Strength for 10 Defence, 25 Expertise, and 17 Agility
If this is of interest to you, perhaps you'd contribute on my PTR [Feedback] thread:
WoW Forums -> [Feedback] Feral itemization: Tank Weapon