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10. To keep costs down, the 4.5-inch Rock Krawler kit calls for used rear TJ Wrangler coils to be utilized in the back. I tried it, and didn't like it at all. The spring rate was too soft, and it sagged too much for my taste. For pure rockcrawling, the TJ coils are fine, but you'll want something with more spring rate for any prerunning.