The front is like any 2wd gmt400.
spindle / drop spring or cut stock spring to dial in your drop.
Rear on a 2 door tahoe can be a little more work to get it down 5 or 6 inches. Can't run a shackle because of the fuel filler neck, also there is a section of the floor on the body, kind of like a floor crossmember that will hit the driveshaft if you go low. i just notched it with sheetmetal.
Pretty sure there are some spots on the frame above the axle that will be close or might touch. its been a while since ive done one. Obviously you'll want a notch also if you're going this low