Chevrolet Silverado / GMC Sierra. Service manual — part 2851

FRONT OUTPUT SHAFT AND INPUT SHAFT CLEANING AND INSPECTION

3

Sprocket Bearing Surface
Tip: Inspect for scoring, brinelling, pitting, or
excessive wear.

4

Transfer Case Two/Four Wheel Drive
Synchronizer Hub Engagement Splines
Tip: Witness marks at the location of the hub is
normal.

5

Transfer Case High/Low Clutch Engagement
Splines
Tip: Witness marks at the location of the
high/low clutch is normal.

6

Transfer Case Input Shaft Pilot Bearing Surface
Tip: Inspect for scoring, brinelling, pitting, or
excessive wear.

7

Oil Galleries
Tip: Compressed air may be necessary to clean
the oil galleries.

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Transfer Case - MP 1222/1225/1226-NQG - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado

Fig. 31: View Of Front Output Shaft & Input Shaft 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 Input Shaft Seal Surface
Tip: Inspect for pitting, excessive wear, or
damage.

2

Transfer Case Input Shaft Bearing Surface
Tip: Inspect for excessive wear, damage, or if the
bearing has spun on the shaft.
Transfer Case Input Shaft Planetary Teeth

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Transfer Case - MP 1222/1225/1226-NQG - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado

3

Tip: Inspect for broken, damaged, or debris
embedded in the root of the teeth.

4

Transfer Case Input Shaft Pilot Bearing Surface
Tip: If the bearing is removed, inspect for
excessive wear, damage, or if the bearing has spun
in the bore.

5

Transfer Case High/Low Clutch Engagement
Teeth
Tip: Inspect the engagement teeth for chips or
excessive wear.

6

Transfer Case Input Shaft Pilot Bearing Assembly
Tip: Replace the bearing if roughness, brinelling,
or pitting is detected. Refer to Input Shaft Pilot
Bearing Replacement (Light Duty) or Input
Shaft Pilot Bearing Replacement (Heavy Duty
and Super Heavy Duty).

7

Transfer Case Front Output Shaft Front Bearing
Assembly
Tip: Replace the bearing if roughness, brinelling,
or pitting is detected. Refer to Front Output
Shaft Front Bearing Replacement.

8

Transfer Case Front Output Shaft Seal Surface
Tip: Inspect for pitting, excessive wear, or
damage.

9

Transfer Case Front Output Shaft Front Bearing
Surface
Tip: If the bearing is removed, inspect for
excessive wear, damage, or if the bearing has spun
on the shaft.

10

Transfer Case Front Output Shaft Driven Sprocket
Engagement Splines
Tip: Witness marks at the location of the sprocket
is normal.

11

Transfer Case Front Output Shaft Rear Bearing
Surface
Tip: If the bearing is removed, inspect for
excessive wear, damage, or if the bearing has spun
on the shaft.

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Transfer Case - MP 1222/1225/1226-NQG - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado

DRIVE CHAIN, DRIVE SPROCKET, AND DRIVEN SPROCKET CLEANING AND INSPE
INSPECTION

Fig. 32: View Of Drive Chain, Drive Sprocket, & Driven Sprocket Inspection Points
Courtesy of GENERAL MOTORS CORP.

12

Transfer Case Front Output Shaft Hole Plug
Tip: Replace the plug, if removed. Refer to Front
Output Shaft Front Bearing Replacement.

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.

Replace any components if damage is found in this procedure. The sprockets must be
replaced as a pair.

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Transfer Case - MP 1222/1225/1226-NQG - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado