Looking at a Suburban

[Madipie03]

Hello everyone. Forgive me but im new to posting here, so If im in the wrong spot forgive me. I'm looking at a 68 1/2ton 4x4 suburban. I'd really like a 3/4ton, but what would it take to swap out the axles and is there a better/easier year of a donor truck/axle for the install? I'd really like to avoid moving perches and shock mounts if possible. If im doing this disc brakes are a must. will I also have to upgrade the yokes on the transfer to a larger size? Thank you