Two/Four Wheel Drive Shift Components Cleaning and Inspection

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: View Of Two/Four Wheel Drive Shift Component Inspection Points

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.
1	Transfer Case Two/Four Wheel Drive Synchronizer Insert Tip: Inspect the inserts for wear.
2	Transfer Case Two/Four Wheel Drive Synchronizer Hub Engagement Teeth Tip: Inspect the engagement teeth for wear.
3	Transfer Case Two/Four Wheel Drive Synchronizer Hub Splines Tip: Inspect the splines for loose fit on the rear output shaft.
4	Transfer Case Two/Four Wheel Drive Synchronizer Assembly Tip: Inspect the synchronizer for wear or chipped teeth.
5	Transfer Case Two/Four Wheel Drive Synchronizer Blocking Ring - Outer Tip: Inspect the synchronizer ring for wear, damage, or missing material.
6	Transfer Case Two/Four Wheel Drive Synchronizer Blocking Ring - Inner Tip: Inspect the synchronizer ring for wear or roughness.
7	Transfer Case Two/Four Wheel Drive Synchronizer Sleeve Engagement Teeth Tip: Inspect the engagement teeth for wear.
8	Transfer Case Two/Four Wheel Drive Synchronizer Sleeve Collar Tip: Inspect the collar for wear.
9	Transfer Case Two/Four Wheel Drive Shift Fork Inserts Tip: Inspect the inserts for wear.
10	Transfer Case Shift Fork Spring Tip: Inspect the spring for breakage.
11	Transfer Case Two/Four Wheel Drive Shift Fork Assembly Tip: Inspect for cracks, broken areas, or other damage. The component must be replaced if damage is found.
12	Transfer Case Two/Four Wheel Drive Shift Fork Pin Tip: Replace the shift fork if the pin is worn.
13	Transfer Case Two/Four Wheel Drive Shift Fork Bore Tip: Replace the shift fork if the bore is worn.
14	Transfer Case Shift Detent Plunger Cam Lobes Tip: Inspect the cam lobes for wear or roughness. The component must be replaced if damage is found. Refer to High/Low Shift Fork Replacement .
15	Transfer Case Two/Four Wheel Drive Mode Cam Lobes Tip: Inspect the cam lobes for wear or roughness. The component must be replaced if damage is found. Refer to High/Low Shift Fork Replacement .