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This is super important to a good driving lifted truck. If the wheels are straight ahead and the truck is at normal ride height, the steering drag link from the steering box arm to the arm on the axle should be completely parallel to the ground. If it is angled up or down you will get lots of bump steer every time you hit even the smallest bump in the road.
Like John said, you will need to modify the spring or other items to lower the lift. Sometimes you can just remove leaves form the spring pack to bring it down some and soften the ride. Often the cheap lift kits will use blocks in the back. If that's what was done, you can sometimes just remove the block and install a shackle flip instead.
