how much of a lift do i have to do to get 33 un der the truck

That's hard to answer w/o knowing which tires and width you would be running,,,,
3"suspension, 3" body , and and, and a little/ alot of cutting , trimming, pounding of the fenderwells.

Brakes and gearing become more of a concern, too, besides just being able to get the tires underneath..

Well, assuming you will be running a 33x12.50 Mud Terrain tire then you have a few options...

1.) 4" Trailmaster Lift with minor trimming on the back of the wheel well

2.) 3" Body Lift with a considerable amount of trimming and a wider rim

3.) 3" suspension combined with a 3" body lift with no trimming needed.

I have a 94 Hardbody and run(well, use to, now I run 32's) 33x12.50 Buckshot Mudders on a 15x10 wheel. I have the 3" Calmini suspension liff combined with a 3" AC Body Lift. The BL works greatand was well worth the money, althoug I can't say the same for the Calmini. My brakes worked fine with the 33"s but they did kill the 4H capabilities. I'm running the 4cyl however so you should be fine if running the V6. I highly doubt "pounding out the wheel wells" would be neccesary with a 3+3 setup even with a 33x13.50.

2" body lift and fender trimming (some hammering along the leading edge of the rocker panel) is all I needed to fit 33x10.5 ona 15x8 Rockcraler steel wheels. No rubbing!