that makes a big difference on what drop you can run. The tire track width will be ~.75" narrower per side than my wheel/tire setup was. I'm not sure of your driving conditions/style, but i think that if you go more than 5" in the front with 275/30r24's you'll lose noticeable turning and have to keep yourself from hitting the fenders. rcsb 2wd NBS trucks with 4.5" of drop have a hub to fender measurement ~15". so any tire over 30" will begin to be tucked. so at 5" drop and 275/30r24, you will be tucking somewhere around .75" to 1" depending on final settling height of the springs after driving on them.