I have a 2000 Silverado with a 6" knuckle kit from Superlift. I didn't install it though, I had a local 4 Wheel Parts do it for me. It was fairly inexpensive, I spent under $4k for the kit, install, new tires and wheels.
As far as the lift goes I'm happy with it so far. I usually go off road at least once a month, mostly trails and mud.
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