Just to give people a bit more info to consider when prioritising gear:
Chewie's Level 7 gear options are a bit odd for a tank. Three of them aren't currently equippable, having level requirements over Level 60. Of the remainder, one adds 25 physical crit rating and another adds 46 physical damage. The last, requiring clvl 59, is +15 str/agi/int, +10 phys damage and +15 resistance.
Given that Chewie's role is mainly to soak damage for the rest of the team, the lack of any bonus health or armor (apart from what you get from the +15 str) is somewhat weird and makes the grind to get into gear level 7 slightly marginal.
So my advice, if you're deciding between grinding for Chewie and one of your other characters.... let the Wookie wait.