Rear LSD Lock, or Rear Limited Slip Differential Lock, is a high-performance differential assembly installed on the rear axle of a vehicle to improve vehicle traction and handling. "LSD" stands for "Limited Slip Differential", which can automatically limit the slip of the differential when there is a speed difference between the left and right wheels, ensuring that each wheel can obtain sufficient driving force, even if This is also true if road conditions are inconsistent or if one wheel is slipping on one side.