Two/Four Wheel Drive Shift Components Cleaning and Inspection

WARNING: This page is about a different car, the 2011 GMC Yukon XL, 2011 GMC Yukon, 2011 Chevrolet Tahoe, 2011 Chevrolet Suburban, and 2011 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Two/Four Wheel Drive Shift Components

Courtesy of GENERAL MOTORS CORP.

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 TIP: Replace the bearing if roughness, brinelling, or pitting is detected.
2	Transfer Case Control Actuator Lever Thrust Bearing Surface TIP: Inspect for pitting, excessive wear, or damage.
3	Transfer Case Control Actuator Lever Bearing Surface TIP: Inspect for pitting, excessive wear, or damage.
4	Transfer Case Control Lever Arm TIP: Inspect for excessive wear or damage.
5	Transfer Case Control Actuator Lever Ball Ramps TIP: Inspect for pitting, excessive wear, or damage.
6	Transfer Case Control Actuator Lever Bearing TIP: Replace the bearing if roughness, brinelling, or pitting is detected.
7	Transfer Case Control Actuator Lever Balls TIP: Replace the bearings if roughness or pitting is detected.
8	Transfer Case Control Actuator Lever Ball Ramps TIP: Inspect for pitting, excessive wear, or damage.
9	Transfer Case Control Actuator Lever Bearing TIP: Replace the control actuator lever assembly if roughness, brinelling, or pitting is detected.
10	Transfer Case Control Actuator Lever Bearing Surface TIP: Inspect for pitting, excessive wear, or damage.
11	Transfer Case Control Actuator Thrust Bearing TIP: Replace the bearing if roughness, brinelling, or pitting is detected.
12	Transfer Case Control Actuator Lever Washer TIP: Inspect for pitting, excessive wear, or damage.
13	Transfer Case Four Wheel Drive Clutch Pressure (Apply) Plate Washer Surface TIP: Inspect for pitting, excessive wear, or damage.
14	Transfer Case Four Wheel Drive Clutch Pressure (Apply) Plate Surface TIP: Inspect for excessive wear, cracks, or damage.
15	Transfer Case Four Wheel Drive Clutch Pressure Plate Springs TIP: Inspect the springs for cracks.
16	Transfer Case Four Wheel Drive Clutch Pressure (Friction) Plates TIP: Inspect for worn, grooved, burnt, or flaking friction material, or warped friction plates.
17	Transfer Case Four Wheel Drive Clutch Pressure (Steel) Plates TIP: Inspect for worn or warped steel plates.
18	Transfer Case Four Wheel Drive Clutch Hub Bearing Surface TIP: Inspect for pitting, excessive wear, or damage.
19	Transfer Case Four Wheel Drive Clutch Hub Teeth TIP: 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 TIP: Inspect for excessive wear, cracks, or damage.
21	Transfer Case Front Output Shaft Drive Sprocket Engagement Teeth TIP: Inspect the engagement teeth for excessive looseness on the front output shaft drive sprocket.
22	Transfer Case Four Wheel Drive Clutch Housing Teeth TIP: 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 TIP: Inspect the splines for excessive looseness on the rear output shaft.
24	Transfer Case Two/Four Wheel Drive Actuator Cam TIP: Inspect the cam lobes for wear or roughness.
25	Transfer Case Two/Four Wheel Drive Actuator Cam Spacer TIP: Inspect the spacer for wear or roughness.