Good evening, and welcome to ChaseNetwork! I found that there are indeed 170 Defense Class Items for the Titan and Hunter. These items are [url=https://www.bungie.net/en/Armory/Detail?type=item&item=454534839&itemname=Mark%20of%20a%20Kellslayer]Mark of a Kellslayer[/url] and the [url=https://www.bungie.net/en/Armory/Detail?type=item&item=3509787&itemname=Kellhunter%27s%20Hood]Kellhunter's Hood[/url]. Any versions of these two items from before the TTK update showed about 3 Defense, however. Any that drop post-2.0 from the PoE Treasure Chest possess a 170 variant. You may get one Treasure Key from re-accomplishing the House of Wolves from the Abandoned Quests kiosk. I hope this helps for preparing for The Taken King!