Chevrolet Silverado / GMC Sierra. Service manual — part 1120

Fig. 356: Locating 3rd & 4th Clutch Backing Plate Retainer Ring
Courtesy of GENERAL MOTORS CORP.

4. Remove the 3rd and 4th clutch backing plate retainer ring (656).

5. Remove all 3rd and 4th clutch plates (653-655).

6. Remove the 3-4 clutch boost spring assemblies (600).

NOTE:

The correct number of fiber plates must be used to avoid
damage to the transmission. An incorrect stack up height can
cause either excessive clutch slippage or insufficient release,
resulting in burned clutch plates.

IMPORTANT: The 3rd and 4th clutch plate stack is model specific. Clutch

plate stack up could be either 6 or 7 plates.

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis

Silverado, Sierra & Silverado

Fig. 357: Identifying Forward Clutch Selective Backing Plate & Retainer Ring
Courtesy of GENERAL MOTORS CORP.

7. Remove the forward clutch backing plate retainer ring (651).

8. Remove the forward clutch selective backing plate (650).

9. Remove the forward clutch sprag assembly.

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis

Silverado, Sierra & Silverado

Fig. 358: View Of Forward Clutch Plates
Courtesy of GENERAL MOTORS CORP.

10. Remove all forward clutch plates (646, 648, 649A, 649B).

11. Remove the input sun gear bearing assembly (637).

12. Remove the input housing to output shaft seal (636).

13. Remove all overrun clutch plates (645A, 645B).

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis

Silverado, Sierra & Silverado

Fig. 359: Installing J 23327-1 & J 25018-A
Courtesy of GENERAL MOTORS CORP.

14. Install the J 23327-1 and the J 25018-A . See Special Tools.

15. Compress the overrun clutch spring, using the J 23456 . See Special Tools.

16. Remove the overrun clutch spring retainer snap ring (635).

17. Remove the J 23327-1 and the J 25018-A . See Special Tools.

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis

Silverado, Sierra & Silverado