When going from 2wd to 4wd up front,it`s like going from a dropped axle to a straight axle.That`ll net some lift right there,too.
I can`t give an actual name.There is no "kit" for what you need.You need your local yellow pages for a spring shop.They can do anything.Try going to the Napco site and ask.Don`t know the addy,just Google.Maybe
www.napco4x4.org