Chevrolet Silverado / GMC Sierra. Service manual — part 979

5. Using the J 24204-2 wing nut, compress the low and reverse clutch plates (2) until hand

tight. See Special Tools.

IMPORTANT: The low and reverse clutch plates need to be compressed

enough to remove the coning from the plates. Hand
tightening the wing nut of J 24204-2 should be sufficient to
remove the coning. See Special Tools.

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

Fig. 468: Measuring Low And Reverse Clutch Stack For Steel Plate Selection
Courtesy of GENERAL MOTORS CORP.

6. Place a 25 mm (1 in) gage bar (2) on the rear surface of the transmission case at a location

near J 44530 . See Special Tools.

7. Measure the distance from the top of the gage bar to the top of the low and reverse clutch

stack (3) (Dimension A).

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

8. Subtract dimension B, the width of the gage bar; from dimension A.

9. Dimension C is the result of the subtraction.

10. Select a low and reverse clutch steel plate based upon Dimension C. Refer to Selective

Components Specifications .

Fig. 469: Cross Sectional View Of Low And Reverse Clutch Stack
Courtesy of GENERAL MOTORS CORP.

IMPORTANT: DO NOT damage the input carrier bushing when removing J

24204-2 from the transmission case. The threaded rod of J

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

11. Remove J 24204-2 (3) and J 44530 (1). See Special Tools.

Fig. 470: View Of Low And Reverse Clutch Fiber & Steel Plates
Courtesy of GENERAL MOTORS CORP.

24204-2 must pass through but not touch the bushing.

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado