Please forgive me if this question has been asked. I used the search feature, but due to my location, I couldn't get the search to load up. I was given the suggestion in a thread I created to use a Spartan locker until I could afford front and rear ARB air lockers. However, after thinking it over, cost wise, as long as my rig locks, I don't necessarily need the ARBs. My question is this. Will the Spartan lockers engage when shifted to low? or do they need to be engaged manually? I can't seem to find much about them in any reviews, and their website doesn't describe them in any detail ad to how they are engaged. Thanks, and sorry if this has been asked.