In order to improve the loss traction situation of the open differential when vehicle driveon some uneven terrains (such as: snow, sand, muddy, rocky), TRE innovated the CrabLocker (Air operated locking differential) to solve the open differential traction issue.Crab Locker with its proven design and comparative advantages than other lockers on themarket. Crab Locker equipped on 18sets 4x4 vehicles over 5 years for extreme off roaddrive test, during the 5 years TRE continued to improve its capability and durability. Withits New Air Operated Actuator Design, unique Oil Return System design, Two Piece CaseStructure Design and easy installation feature, Crab Locker finally released on the market.Crab Locker is your best choice for weekend off road trip or extreme 4x4 off road drive. Why do you need Crab Locker? How does Crab Locker work?When driving off road on some uneven terrains (such as:snow, sand, muddy, rocky), at some point will cause either afront or rear wheel to lift of the