Hummer H2. Manual - part 2551

z

Damaged tangs  

z

Cracks  

9. Install the overrun clutch hub (639) onto the sprag clutch inner race and input sun gear assembly (640).  

10. Install the overrun clutch hub retaining snap ring (638). 

Fig. 175: Checking Sun Gear Rotation

 

2004 Hummer H2 

2004 TRANSMISSION/TRANSAXLE Automatic Transmission - Overhaul - 4L60-E/4L65-E

  

Courtesy of GENERAL MOTORS CORP.

11. Test the forward clutch sprag assembly for proper operation. 

1. Position the forward clutch sprag assembly with the input sun gear facing up. 

2. Hold the forward sprag clutch outer race with one hand and rotate the input sun gear with the other 

hand.  

12. Install the forward clutch sprag and input sun gear assembly into the input clutch housing.  

13. Index the overrun clutch hub into the overrun clutch plates.  

FORWARD CLUTCH ASSEMBLY ASSEMBLE 

IMPORTANT: If the forward clutch sprag assembly operates backwards, you have 

installed the sprag backwards. Reassemble the sprag correctly.

IMPORTANT: The sun gear should only rotate in a counterclockwise direction.

 

2004 Hummer H2 

2004 TRANSMISSION/TRANSAXLE Automatic Transmission - Overhaul - 4L60-E/4L65-E

  

Fig. 176: Inspecting Forward Clutch Assembly For Wear Or Damage 
Courtesy of GENERAL MOTORS CORP. 

1. Inspect the forward clutch waved plate (648), the apply plate (646), the fiber plate assemblies (649B), the 

steel plates (649A) and the selective backing plate (650) for the following conditions: 

z

Damaged tangs  

z

Delamination  

z

Excessive wear  

z

Heat damage  

z

Flatness  

 

2004 Hummer H2 

2004 TRANSMISSION/TRANSAXLE Automatic Transmission - Overhaul - 4L60-E/4L65-E

  

z

Surface finish damage  

z

Burrs and nicks  

Fig. 177: Identifying Forward Clutch Apply Plates 
Courtesy of GENERAL MOTORS CORP. 

2. Install the forward clutch apply plate (646).  

3. Install the forward clutch waved plate (648).  

4. Install the forward clutch steel plates (649A) and alternate with the fiber plate assemblies (649B).  

5. Install the forward clutch selective backing plate (650). 

 

2004 Hummer H2 

2004 TRANSMISSION/TRANSAXLE Automatic Transmission - Overhaul - 4L60-E/4L65-E