I have 33's on my 93, I also used the fix of spacing the bumper out a little. The tires don't really rub unless you crank it all the way to the far right or left. ( I always try and avoid this anyways since the stock Ford power steering pump for this year seems to scream like a banshee when you do that anyways!) There is another problem I would like to address when adding larger tires to your rig, and that is the ABS system.
As I stated at the beginning of this article, I have a 1993 and I am not sure if it is just my Bronco or if it is the entire series ( I believe two different types of ABS systems were used the RABS I and II) but ever since I put 33's on I have had quite a few problems with the ABS system. The most noticeable problem is that when coming to a complete stop as you press on the brakes they work fine up until about slowing down through 12-15 mph. At this point the brakes seem to feel spongy and actually release. My solution is to press the brakes as I am slowing, kind of in a slow methodical "pumping" action. For example I slow down to about the point I know they are going to go soft, then I let my foot off and about half a second later I step on them again. This method, although annoying, seems to work very well. I have taken my ride to several brake "specialty" shops as well as the dealer and I can't get a straight answer from any of them.
As you know when you put larger tires on it will mess up your speedometer if no recalibration is made. So, along with somewhat inaccurate speed and mileage readings, I believe that the braking problem has to do with the larger tires, allow me to explain: It is my understanding through what I have read in the Haynes manual as well as several articles online, that the ABS is designed to release brake fluid pressure when the ABS sensors determine that the wheels have "locked" up so as to allow the vehicle to maintain better control. I believe that since the tire size changed and no adjustments were made to the speedometer ( which I am pretty sure is controlled through a computer) the vehicle is somewhat confused and is causing this action. I will put a link on here to a website that explains how to recalibrate the speedometer. If anyone has done this or is going to do it, please let me know if it works. I am writing this from Iraq and won't be home for quite some time. The recalibration techqnique is my last best hope for fixing this problem, and quite honestly I am thinking that the next time I get a set of tires I am going to just put the stock 31's back on. Hope this helped, good luck!
http://www.ford-trucks.com/article/idx/8/0...AND_BRONCO.html
