Just installed the disc brake kit from lugnut4x4.com Sunday, pretty straightforward install, just a couple things to note.
First, our axle tubes neck down just before where the backing plates bolt on and continue on to the end of the axle. The 3.5" brackets o got were a bit too big but I never measured the actual size of them. I will later and post itnup.
Second, my studs had a shoulder on them that the drum sat on. After cracking the casting on the first hole I drove it into I realized there may be a problem. Turns out the GM discs have a smaller hole than our drums, An 11/16" bit opened them up to the correct size, the shoulder's measurement was .678".


Otherwise they seem like a good, simple upgrade. My booster isn't working so I've been running non-power brakes, and it's much easier to hold the truck in place with this setup. I've got a full 2ndgen hydroboost setup to install laying in my living room, I just can't remembered it interferes with a factory IC piping so I've got to look it up before I try.
I also picked up a set of 37/12.5/17 KM2's that will be residing under it.

I didn't want the wheels and dude didn't want to have them dismounted so he threw them in for free.

