Dual piston calipers with a lot larger pads.
I have a slide in camper thst weighs 2000+ i travel in the hills quite a bit
I put 6 sets of brakes on it before upgrade, now the truck will actually stop instead of just alowing down
I have done this swap to my 99 K3500.
Donor truck for spindles and hydro-boost was a 2003 2500
I used the master cylinder, hubs, rotors calipers and brackets from 2003 dually (larger)
from memory
modified tapered ball joint holes by reaming with tapered reamer
had to bore spindles and...