I have a 08 FJ 4x4 without a locker and A-trac. I was thinking of doing a ARB air locker in the rear to help with the traction. Another question is, would I be better off doing a front locker instead? I dont have the budget to do both right now. I'm not sure if I have the skill to install this on my own. I've never worked with gears or diff's. So, I was wondering if anyone knew of a shop in the MA or NH area that does these installs. Any help or advice would be appreciated. Thank you.