[chevy suspension help.]

No you cannot, it is to wide, you can crank your bars about an inch and add a key, and a 3 inch block for a 3 inch suspension, that would clear 33 12.50s on an 8 inch wide rim, even adding a 3 inch body on top of that, it still requires trimming or with a 305 size tire.. bout a 34-34.5 x 12 no trimming

[2001 tahoe 2wdrive height help]

You would have to do a 2-3 in lift coil, but the ride will suffer a little.. your going with a stiffer spring that is compressed a lot which makes it even stiffer.. I would prolly lean towards a simple coil spacer..

[02 tahoe how low can u go]

You can only go about 4in without a notch in the back, so a 2/4 kit would work... But it won't be enough... Just go with a 4/6 and notch it