When a body lift is performed on your vehicle, many things need extending.
To make your body lift work, there are a number of components that will need extending to ensure the connection between chassis and engine is maintained. The most critical extension is the steering extension, which has to be carefully designed and compliant (i.e. no zinc plating or welding).
Without the right body lift extension, your steering shaft could snap.
Scary, but true. Of course it's imperative in terms of safety for you and your family to ensure that full spline engagement is integral... because in some cases steering shafts have snapped due to fatigue and too much flexing so close to the end of the shaft. An extension will fix this!