What year is your Bronco? If it has an 8.8 it should have 31 spline axles, im not sure what the 9 inch runs but I'm thinking 31's as well. Mini spools or any spools for that matter are extremely ******* axles and tires. Driving on the street with a spooled diff is tricky, you have to corner slowly and you inner tire has to actually spin to keep up with the outer tire in order to turn, causing some severe tire damage, if you have too much traction it would be easier just to snap the axle. They are a real bear on the road. If you try to corn fast your front end will plow and you will keep going straight. Mini spools are attractive because of their low cost, but when you factor in the cost of new axles and tires you will quickly learn that they arent really all that cheap after all.
