Can I fit 33’s if I already had 35’s already???
They'd fit but I don't know if it would be worth it. You'll have to take the tires off, replace them with the new tires and put them back on. You should also lower your lift height. If you have adjustable leaf springs that isn't a big deal but if you went with non-adjustable then you'd have to pull them as well to remove a few leafs. The front should also be lowered which would probably cause you to have to buy a shorter spring.
It will work but it'll be a lot of work to make it work. lol