Two/Four Wheel Drive Shift Components Cleaning And Inspection

WARNING: This page is about a different car, the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, and 2018 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Two/Four Wheel Drive Shift Components Cleaning and Inspection

Courtesy of GENERAL MOTORS COMPANY

Callout	Component Name
Preliminary Procedure Inspect all components or sub-components and perform any repair procedure necessary to fix the damage. If the damage cannot be repaired, replace the component or sub-component as indicated. Clean all components in cleaning solvent and air dry, except the clutch plates.
1	Transfer Case Control Actuator Thrust Bearing NOTE: Replace the bearing if roughness, brinelling, or pitting is detected.
2	Transfer Case Control Actuator Lever Thrust Bearing Surface NOTE: Refer to Service Parts Release Usage Change - NQH/NPO Control Actuator Levers in the New Product Information Inspect for pitting, excessive wear or damage.
3	Transfer Case Control Actuator Lever Bearing Surface NOTE: Inspect for pitting, excessive wear or damage.
4	Transfer Case Control Lever Arm NOTE: Inspect for excessive wear or damage.
5	Transfer Case Control Actuator Lever Ball Ramps NOTE: Inspect for pitting, excessive wear or damage.
6	Transfer Case Control Actuator Lever Bearing NOTE: Replace the bearing if roughness, brinelling or pitting is detected.
7	Transfer Case Control Actuator Lever Balls NOTE: Replace the bearings if roughness or pitting is detected.
8	Transfer Case Control Actuator Lever Ball Ramps NOTE: Inspect for pitting, excessive wear or damage.
9	Transfer Case Control Actuator Lever Bearing NOTE: Replace the control actuator lever assembly if roughness, brinelling or pitting is detected.
10	Transfer Case Control Actuator Lever Bearing Surface NOTE: Inspect for pitting, excessive wear or damage.
11	Transfer Case Control Actuator Thrust Bearing NOTE: Replace the bearing if roughness, brinelling or pitting is detected.
12	Transfer Case Control Actuator Lever Washer NOTE: Inspect for pitting, excessive wear or damage.
13	Transfer Case Four Wheel Drive Clutch Pressure (Apply) Plate Washer Surface NOTE: Inspect for pitting, excessive wear or damage.
14	Transfer Case Four Wheel Drive Clutch Pressure (Apply) Plate Surface NOTE: Inspect for excessive wear, cracks or damage.
15	Transfer Case Four Wheel Drive Clutch Pressure Plate Springs NOTE: Inspect the springs for cracks.
16	Transfer Case Four Wheel Drive Clutch Pressure (Friction) Plates NOTE: Inspect for worn, grooved, burnt or flaking friction material or warped friction plates.
17	Transfer Case Four Wheel Drive Clutch Pressure (Steel) Plates NOTE: Inspect for worn or warped steel plates.
18	Transfer Case Four Wheel Drive Clutch Hub Bearing Surface NOTE: Inspect for pitting, excessive wear, or damage.
19	Transfer Case Four Wheel Drive Clutch Hub Teeth NOTE: Inspect for excessive wear or damage. Excessive wear can be identified by steps in the teeth.
20	Transfer Case Four Wheel Drive Clutch Hub Friction Plate Surface NOTE: Inspect for excessive wear, cracks or damage.
21	Transfer Case Front Output Shaft Drive Sprocket Engagement Teeth NOTE: Inspect the engagement teeth for excessive looseness on the front output shaft drive sprocket.
22	Transfer Case Four Wheel Drive Clutch Housing Teeth NOTE: Inspect for excessive wear or damage. Excessive wear can be identified by steps in the teeth.
23	Transfer Case Four Wheel Drive Clutch Hub Splines NOTE: Inspect the splines for excessive looseness on the rear output shaft.
24	Transfer Case Two/Four Wheel Drive Actuator Cam NOTE: Inspect the cam lobes for wear or roughness.
25	Transfer Case Two/Four Wheel Drive Actuator Cam Spacer NOTE: Inspect the spacer for wear or roughness.