why? im confused by what you are trying to do. there is alread a huge rack from the factory and you want to make it worse? just do the frpp lowering springs that are 1.5 all the way around and you will still have a decent rake. you will need a 59-61 offset in the rear to fit a 315 on an 11" wheel. 315/30 will be kinda short though. thats probably around a 26" tire, so if you did run that, you wouldn't want less than a 2 inch drop in the back, or you would have more wheel gap than a raptor.
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Pre-5.0 Hellaflush
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