A suspensions lift should never be stacked with another suspension lift. Our suspension leveling kits are designed to install directly to your factory suspension, NOT to be stacked with another lift kit. On the contrary, up to a 3' BODY lift kit (using body spacers to lift the body of the vehicle from the chassis) can be used in addition to a leveling kit as long a professional can make to necessary adjustments for such things as steering columns, brake lines, shocks, etc.