in my opinion most of our runners dont need rear disk... for performance you can do a tundra front swap w/ good pads/ rotors, oem full rear drum rebuild, ss brake lines all around and a good fluid..... disk brakes all around do look good.. but most of us dont run big enough wheels to see the bling anyways.. jus my 2
With a welder, a cut off wheel, and the proper tools, anything is possible.
You'll lose your parking brake, and have to go to a t-case mounted version...
More trouble than it's worth.
Swap your entire axle for a 4th gen w rear disk. Or beter yet,get an elocker axle off an fjc
They are wider by 5" or so.