Chevrolet Silverado / GMC Sierra. Service manual — part 2850

TRANSFER CASE REAR HALF CLEANING AND INSPECTION

Fig. 28: View Of Transfer Case Rear Half Inspection Points
Courtesy of GENERAL MOTORS CORP.

11

Transfer Case Shift Detent Lever Bearing
Assembly
Tip: Replace the bearings if roughness, brinelling,
or pitting is detected. Refer to Shift Detent
Lever 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.

Clean the rear case half in cleaning solvent and air dry.

NOTE:

Refer to Machined Surface Damage Notice .

2008 Chevrolet Silverado 1500

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

Sierra & Silverado

Remove any sealant from the sealing surface.

1

Transfer Case Rear Half Assembly
Tip: Inspect for cracks, broken areas, or other damage. The
component must be replaced if damage is found.

2

Transfer Case Rear Output Shaft Rear Bearing Outer
Retaining Ring Groove
Tip: Replace the rear case half assembly if the groove is worn.

3

Vehicle Speed Sensor Threads
Tip: Replace the rear case half assembly if the speed sensor
threads are damaged.

4

Transfer Case Rear Output Shaft Rear Bearing Bore
Tip: Replace the rear case half assembly if a bearing has spun
or if cracks are detected.

5

Case Sealing Surface
Tip: Repair small scratches or nicks with a soft stone.

6

Transfer Case Front Output Shaft Rear Bearing Bore
Tip: Replace the rear case half assembly if a bearing has spun
or if cracks are detected.

7

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

8

Transfer Case Locating Pin Holes
Tip: Replace the rear case half assembly if the locating pin
holes are out of round or damaged.

9

Transfer Case Rear Output Shaft Bushing
Tip:

Replace the bushing if it is damaged or worn.

For light duty (LD) vehicles, refer to Transfer
Case Disassemble and Transfer Case Assemble .

For heavy duty (HD) and super heavy duty (SHD)
vehicles, refer to Rear Output Shaft Bushing
Replacement .

If the bushing is removed, inspect the bushing bore for
signs of spinning. Replace the rear case half assembly if
the bushing has spun.

2008 Chevrolet Silverado 1500

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

Sierra & Silverado

OIL PUMP CLEANING AND INSPECTION

Fig. 29: View Of Transfer Case Oil Pump Assembly & Suction Pipe
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 Oil Pump Assembly
Tip: Replace the oil pump assembly if end play
is evident, or if there is any sign of binding. Do
not disassemble the oil pump. The oil pump is
serviced as an assembly.

2

Transfer Case Oil Pump Suction Pipe
Tip: Replace the oil pump suction pipe if the
screen is embedded with debris.

2008 Chevrolet Silverado 1500

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

Sierra & Silverado

REAR OUTPUT SHAFT CLEANING AND INSPECTION

Fig. 30: View Of Output 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 Rear Output Shaft Splines
Tip: Witness marks at the location of the yoke
are normal.

2

Transfer Case Oil Pump and Rear Output Shaft
Speed Reluctor Wheel Engagement Splines
Tip: Witness marks at the location of the
components are normal.
Transfer Case Front Output Shaft Drive

2008 Chevrolet Silverado 1500

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

Sierra & Silverado