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Was the front axel rebalanced after the lift was installed? did you install it? was the axel rekeyed and rotated after the kit was put in? This will definitely cause a bad vibration. start there.
I doesn't install the kit and in reality i doesn't own the truck. i'm looking to buy it but the problem is the truck is a VGA ( a truck who was scrap and was rebuilt) my fear is the frame was twisted....