I think one of the reasons why my OEM axles haven't given me any trouble with the amount of lift I have is because of the surface rust that has likely accumulated on the inner CV splines. It took an overnight bath in PB Blaster to get my front, driver-side axle out after the outer CV joint blew (before using PB Blaster I couldn't get the axle out of the differential even after hooking it up to my truck!). Anyways, as stated, without the rust it's likely that my inner CV joints would have popped out of the differential by now. My front driver axle was just replaced with a High Lifter Outlaw DHT axle, my front passenger axle is still OEM...for now. What I'm getting at here is that if all you're looking to accomplish is to eventually be able to clear a set of 30s, I'd stick with a 2"-2.5" Lift Kit, a set of Forward A-Arms, and leave the coil springs alone. At this point you'll already be right at the edge of what the OEM axles can handle; going any further may mean purchasing replacement axles... Not to mention that the lift and arms should be enough to clear a most 30" tall tires and if the springs start to sag a little, I wouldn't worry about them until the tires start to rub and then just fab you up some springs spacers.