I installed them on my 2009 GMC Sierra. Installation wasn't bad, took 3 hours. I know some reviews said it could be done in an hour, but I have to assume they worked in a garage with an elevator and power tools. I didn't go much faster between loosening rusty bolts and crawling under a truck to lay pipelines. The air lines that came with the shocks were long enough for my setup. They gave me 10 feet of line and I used 6. The shocks held the pressure for about a week and then they snapped the line. During installation I noticed that I could pull on one of the wires after I thought I had tightened the nut enough so I tightened it. It wasn't the one that showed up, so I would recommend that you give each fitting a good check during installation. I should have gone back and checked them all out when I found this one, but I didn't. You have to tighten it and pull hard on the leash to try to pull it out. If it comes out, put it back in and tighten it more tightly. If you think they're okay, put at least 100 pounds of pressure on them and see if they hold up. I did this to all of them after the leash broke and they held on. I will update my review when they come back. Monroe definitely needs to improve the catenary connection. For me, that's a big problem with them. It's very hard to tell if they're tight enough and it seems like they hold their breath for a long time because of that.
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