a 3"- 4" body lift? wow.... someone hasnt done any research....
um, dont get a bodylift... unless its like a 1" lift... a 3-4" body lift is going to look disgusting and may cause onlookers to vomit when they see your 3.4L below your body...
or when you hit a curb and your body keeps going but your frame and wheels will stop, if you want a lift, either stick with a 1" BL or actually drop some money and get a 2.5" suspension lift from OME. as for a selectable locker, i would recommend ARB, or OX. both are expensive, but there is a reason for that. detroit has some options that would work but i dont think they are fully selectable, but please, for toyota respect, do not get a 4" BL on it, remember, you drive a toyota, not a chevy