What is the installation like? I heard some say there is a bolt.
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I don't remember because I did the free travel mod which entails cutting the entire bracket that holds the bumpstops off the frame with a sawzall, which is what you need to do if you're hitting them. I've never heard of anyone replacing a stock rear one because like I said, they rarely, if ever, are used. They're only for bottoming out, which is completely different than what the front jounce stops are for. The fronts are in constant use. If you're hitting the rear ones in any situation other than when you're absolutely flying over huge bumps, then you don't need new rear factory bumpstops- you need to do the free travel mod and get rid of those factory ones along with the bracket that holds them on. THEN the new small aftermarket ones bolt on, in a new hole you drill in the frame. This mod gives you about 4" more travel, I believe, before bottoming out. I lowered my Denali 3" in the rear and I did the mod even though I don't believe I ever bottomed out, but I have autoride enabled.