Fitment Buick Rainier 20042007 Chevrolet Trailblazer 20022009 Trailblazer EXT 20022006 GMC Envoy 20022009 Envoy XL 20022006 Envoy XUV 20042005 Isuzu Ascender 20032008 Oldsmobile Bravada 20022004 Reference Numbers Replacement for 600103, 10033321, TCA87, V51730138, 1S11005, 1SW8269, 12471631 Specification Terminal Quantity: 4 Terminal Type: Blade Direct Fit OE Replacement brand locking hub axle actuator Please enter your vehicle information in the left corner to confirm the vehicle compatibility before Benefits and features Restores proper 4x4 engagement by replacing a faulty locking hub axle actuator OEgrade replacement designed for reliable performance and fit Compatible with multiple GM SUVs and related models to simplify sourcing Use scenarios Scenario 1: Front axle 4WD engagement not occurring on a Buick Rainier or Trailblazer due to a failing locking hub actuator Scenario 2: Intermittent 4x4 operation or grinding noises when switching into 4WD, indicating actuator wear or failure Scenario 3: Afterwater exposure or corrosion detected in the locking hub area, replacing with an OE replacement actuator to restore 4WD capability Notes Confirm compatibility by verifying your vehicle information in the left corner before Direct replacement ensures a straightforward install without modifying other components