I'm not so sure about that, it's not very clear, and doesn't' mention manufacturer. Still, that makes ALL lift kits illegal that use replacement knuckles, drop pitman arms, steering relocations, upgraded tie rods/tie rod ends, etc.

This is also pretty funny:

55-9-215(b)(2)

No person shall operate a four-wheel drive recreational vehicle of a type required to be registered under the laws of this state upon a public highway or street modified by reason of alteration of its altitude from the ground if its bumpers, measured to any point on a load-bearing member on the horizontal bumper bar, are not within the range of fourteen to thirty-one inches (14''-31'') above the ground, except that no vehicle shall be modified to cause the vehicle body or chassis to come in contact with the ground or expose the fuel tank to damage from collision or cause the wheels to come in contact with the body under normal operation, and that no part of the original suspension system be disconnected to defeat the safe operation of the suspension system; provided, that nothing contained in this section shall prevent the installation of heavy duty equipment to include shock absorbers and overload springs; and provided further, that nothing contained in this section shall prevent a person from operating a motor vehicle on a public highway with normal wear of the suspension system if normal wear does not affect the control of the vehicle. In the case of a four-wheel drive vehicle where the thirty-one-inch limitation is exceeded, the vehicle will comply with this section if the vehicle is equipped with a drop bumper. The drop bumper must be bolted and welded to the frame of the vehicle and be made of a strength equal to a stock bumper.

- See more at: https://www.tn.gov/lawsandpolicies/article/55-9-215.-operation-of-motor-vehicle-without-adequate-energy-absorption-sys#sthash.wqWiwxWp.dpuf

So you can lift your truck, run drop bumpers (if your bumpers end up over 31"), as long as your frame height isn't too tall, and it still uses all of the original suspension system and steering...

Laws can be interpreted weird though, take the highlighted part for example: that no part of the original suspension system be disconnected to defeat the safe operation of the suspension system.

One could argue intent here, because you can/could disconnect part of the original suspension system, to replace it with another part/type of suspension system capable of safe operation. NOT with the intent to defeat the safe operation of the suspension system.