hey I thought front first due to a lsd in the rear?
Nah man, ask any ARB sales man or anyone who knows and installs air lockers, they will say the rear locker first, even though you have an LSD.
Why because a front locker puts a lot of stress on the CV joints when driven hard, without the help of a rear locker that gives forward momentum it could 'easily' damage a lot of unknown stuff, such as clutches, gear boxes, and mainly CV's.
All IFS Toyota's are known to have weak CV joints, its a fact of life lol, hence you have 04 LC.
Good luck