If you want to fit 33x12.50R15's you'll need more lift and more bumpstop extension.
Typically 33's are fit in two ways:
1. 4" of lift, with 2" front and ~2.5" rear bumpstop extension, with a CV shaft.
2. 2.5" of lift, with a 1" BL, with 1" front and ~1.5" rear bumpstop extension, with a MML + small t-case drop.
Bumpstop extension height needs to be taylored to your shock length and tire size, on your rig...those numbers are just estimates.