What you have to worry about as far as rims is on the front. When you use a dropped axle you need to modify the steering arms so the tie rod will go under the springs. The easiest way to do the mod. is put the tie rod on the bottom side of the steering arms instead of top side. When this is done it puts the tie rod end close to your side wall of the tires. If you use a wider rim the off set of the rim may be to the inside and the tie rod end will rub on the tire side wall or be really close. This is something you need to watch....SID