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The 4WD axle actuator housing also called axle disconnect housing is part of differential that houses the gears and shift fork required to lock both front axles together. It works together with transfer case to send torque to all four wheels. Most of the time the vehicle is in RWD.When 4WD is engaged transfer case engages the front driveshaft. Its still necessary though to connect two front constant velocity CV axle shafts. This is done via a front differential and the axle actuator.. Due to its location underneath the vehicle the axle actuator housing can be exposed to dirt road salt and other pieces of road debris. These can damage the actuator housing which will make it less effective at protecting the moving parts inside. Then dirt can get inside of the actuator to cause bearing wear or lubricant leakage. Wear can also simply occur over time from use. If you try to shift the vehicle into 4WD at speed the high forces involved might crack the actuator housing.. This 4WD AxleAactuator Housing Fits for the Following Vehicles: 2004-2007 Buick Rainier 2002-2009 Chevro-let Chevy Trailblazer 2002-2006 Chevy Trailblazer EXT 2002-2009 GMC Envoy 2002-2006 GMC Envoy XL 2004-2005 GMC Envoy XUV 2003-2008 Isuzu Ascender 2002-2004 Oldsmobile Bravada.. Our Four-Wheel Drive 4WD Actuator Housing is quality-engineered to restore the four-wheel drive to proper operation. It includes all the hardware necessary for a complete repair. It helps shift four or all wheel drives to rear wheel drive and helps shift four or all wheel drives to rear wheel drive. Direct replacement for a proper fit every time..Hardware > ToolsBenefast