2015-2021 Tundra 4" Lift Kit (44-5640)Description This ReadyLift system is built around maintaining correct alignment and geometry specifications, bump stop extensions all the way around, and sway bar frame mount brackets to keep the front sway bar in a factory position. To keep you driving on the factory Bilstein Fox reservoir shocks, shock stem extensions extend the installed length of the shock without altering the compressed and extended length. Everything in this kit is engineered to