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I did actually use the Extreme drop x member on my C10. I installed it because they recomend it when using 6" of drop. Based on my past experience with lifting 4x4s, if a manufacture recomends an item you'll generally need it.....I really feel that you can get by without it myself. That was the first truck we ever lowered so we didn't try to cut any corners. We've since just been having the holes cut in the trailing arm crossmember at the exhaust shop before the pipes are ran. If you're just dead set that you want their crossmember, I can tell you it's a booger to do with the cab on. There are a LOT of rivets that have to be removed. It'll definitly test your patience, friendships and add a couple hours to the job.