I ordered a single leaf rough country leveling kit for my 250. It lifted the front right at 2". It looked good. I dont know how big you can actually go but I was running a 285 and there was plenty of room. I believe you could run a 305 just fine. I put that same kit in 3 other SD's and they were all happy with it to. I payed about $75 for it and it came with bolts.
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