Thanks for the reply Big Blue. I can't see signature pics yet, but I have seen your commander before. What do you mean installing the Superlift requires modifying the wheel tubs? This is exactly why I'm confused. There's a guy who works at the off road shop who put a Superlift on his moms Commander with 33's and he said he did no mods and had no rubbing. Why is there such conflicting information?
That's a pretty vague statement, so, I don't know what to tell you about that - did you ask they guy the specifics of his mom's set-up? Suspension upgrades that were done? How many miles are on it? What size engine does his moms XK have? The exact TIRE make, model & size? What size, brand of rims he has? Backspacing & offset of the rims?
Size, offset & back-spacing of rims always has something to do with it; Almost everybody is running rims with different specs;
It's really not very confusing, if you step back and really look at all of the factors that come into play.
There is no one definitive answer that will cover everybody because everybody has slight variations in their set-up. I had quite a bit of cutting done by a professional 4x4 shop; The vast majority of my suspension has been upgraded including upper & lower control arms and I'm barely clearing 33's. I have a WAM custom steel front bumper too, so, maybe that's a factor.
My shop told me that Superlift recommends modifying the wheel tubs prior to the installation of their lift. From the clearance I see when I look at my XK, I can see why they make that recommendation.
If you want to try and have a 4 inch Superlift installed with 33 or 34 inch tires without any cutting or modifications, go right ahead and give it a shot - but I think you'll be in for a few surprises along the way. See the below pic if you want an idea of what it will look like.