What do you mean by air springs from a Nissan? I thought a lont time about an air bag inside my rear springs for lift, but the only problem I saw with it was when you go off road and you are in an uneven ground, the rear springs won't contract because of the air bag and a rollover would be more eminent. When my right tire is fully stretched in an uneven ground, my left spring contracts fully leaving my truck straight and more balanced. Oh! Do add the body lift to that lift, you'll really like it and it is not too difficult.

1985 Toyota 4x4 4Runner. 1989 Suzuki Sidekick 4x4.