Leveling kit on 2003

[powerstroke 825]

Ok i clearly have an 03 truck which means i have leafs. So my question is, What is the biggest wheel tire combo i can run with a leveling kit and i plan to put new shocks on the truck as well! As well as backspace. I would like to get fairly deep wheels in 18's or 20's with like 33/12.50's Iam open for suggestions on brands of levels and shocks as well! Thanks for the help!

[Simpleman87]

My buddy is running 35 in his 04 I'm running 33 with my 3in leveling kit

[mudmaster]

I have 35x12.5x17 on my 04 with a 2.5" leveling kit.

[amdriven2liv]

I have 35x12.5x18 with a 2" leveling kit.

Rubs the leafs on full turn.

[xjeeper]

I am running 35" 12.5/17s terra graplers on 17x9s with a Zone 3" level kit on my current 04 6.0 ccsb fx4, if you run a deep rim it will rub on the wheelwell corners. the picture in my avatar is my old 04 315/75/16s on 16x10s 4" backspace, still rubbed on a 4" procomp that measured 5" actual lift, I like my zone level kit with bilstein shocks. Wheel backspace and width are critical, I used to manage a 4x4 shop and did countless installs on leafspring Superdutys, some people even fit 315s on oem rims with no lift, 305s fit on oem rims, although 285/75s are a better choice than 305 70s(they are taller anhave a flatter footprint on the oem rims, I run them on my excursion).