Treek has no gear slots
I cant seem to equip Treek with the armor i received. when i go to the companion inventory there are no gear slots just weapon and customization slot. when i hover over the armor is says required companion, but i clearly have Treek summoned.
Companions no longer require gear for stats, so the only companions that have any kind of gear slots are companions that show the gear when you put it on them, and not all of those do as well. As Treek does not show the gear you put on her, she has no slots for anything other than customization and weapon.
All a companion needs for gear now is a weapon equipped so they can use their abilities, and it doesn't have to be a good one, just one they can use. This was a change made with the luanch of 4.0 back in October 2015.
