Titan recommends that the LSD is serviced every 12 months, race season, or every 10,000 road use miles. These Service Kits contain replacement Sintrak Coated Friction Discs (option of Carbon Coated for BMW 168/Sierra 7" application), Springs, Washers and Pre Load Shims. We have also included replacement Cap Bolts as the originals would have been subject to torque stretch and should not be reused.