Yes.
Yes.
DJM sells the kit. You drill out the spindle and put in a tapered insert, this way you can flip the insert over and go back to stock. Just need to make sure wheels will clear.
04' RCSB, LQ9, Front mount T76, TU1, Circle D 3K, Built 4L60E, True Trac, 3.42:1, 4-6 Drop