I'm getting ready to do a suspension lift on my van, but looking at pictures of other vans, I suspect I already have a lift.

My van is a conversion with a drop floor. They had to put a 33 gallon tank in the back so I think they might have put better springs back there.

My front measurement from center of wheel to fender is around 18.25"

My rear measurement from center of wheel to fender is around 19"

I'm running 31s on a 15 wheel.

Wonder if I can go to 33 without doing anything extra other than trimming part of the front bumper.

 

that looks like stock ride height to me.
I've had three ford vans and (like a nerd) I always have my eyes on other vans.

 

You most likely have a body lift. When they drop the floor, it doesn’t sink into the frame. The whole body is lifted and the floor is dropped. How much does the floor drop?
On the picture from the front your body mounts do not look very tall though.

The current measurements are probably the result of a modest body lift and tired springs. Your rear spring look like the original 2+1 springs.

When I put 31s on my e150. Had to trim the weld seam and push back a little bit the rear of the front fender. Do not forget the gearing. Running 31 your gear are abut 5% taller than the stock van on 29”. Going to 33” you will be over 10%. What gear do you have in the rear? 3.55? 3.73?

 

Thanks for the answer. Not sure why I never checked but there IS a 2" block in the rear but no spacers in the front.

The drop flooring I measure from the inside is about 4-5"

My gearing is stock. Should I think about regearing if I go 33". I'm thinking about a rear locker so should ask the shop about it? What are your thoughts?