if not, wow... \
i dont really know where to start, check out demello offroad's SAS on a 2005 Tacoma, after that, check out the SAS kit that all pro offroad has out for the 2005 tacoma, im not sure what the differences are in the new body taco and new body 4runner.... but an SAS is serious stuff, are you building this to be a show truck? because you dont come across as the type to be a serious offroader...
if you plan on doing this, then be sure to brush up on your welding skills and fabbing skills, as you will need them. look at TTORA and figure out what you want to do, check out yotatech.com as that is more the SAS spot than this, but be forewarned, if you just go in there with a 2wd 4runner wnating to convert it and throw a solid axle under it, a few people are not going to be very nice, but its your truck, if you want to do it, do it, im sure a few people would even be up to help you if you supplied proper equipment... beer... good luck, and keep us updated, any more questions or requests for pics let me know