I got a lot of info from Victor Tezanos, at www.Wilwood.com , they have a front kit for my 88 & will make up a kit for the rear, front $1410, rear $2424, this is w/ a parking brake.
Expensive, but one of the best brake systems out there!!
wasn't there also a Pathfinder that came with disc brakes that should fit with minimum work? I just don't know the year and would like to look into that for my own truck as well.