Chevrolet Silverado / GMC Sierra. Manual - part 921
(5) can be removed.
23. Remove the retaining ring (5) from the groove in the 1-2-3-4 clutch housing.
24. Remove the retaining ring (5).
25. Remove all J tools.
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
Fig. 274: 1-2-3-4 Clutch Piston Housing Components
Courtesy of GENERAL MOTORS CORP.
26. Remove the 1-2-3-4 clutch balance piston (1) from the 1-2-3-4 clutch housing (4).
27. Remove the 1-2-3-4 clutch piston return spring assembly (2) from the 1-2-3-4 clutch housing
(4).
28. Remove the 1-2-3-4 clutch piston (3) from the 1-2-3-4 clutch housing (4).
Fig. 275: Locating Clutch Piston Seal Rings
Courtesy of GENERAL MOTORS CORP.
29. Remove the seal rings (1 and 2) from the 1-2-3-4 clutch piston (3).
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
Fig. 276: 1-2-3-4-, 4-5-6 Clutch Housing & J 24204-2
Courtesy of GENERAL MOTORS CORP.
30. Position the 1-2-3-4, 4-5-6 clutch housing (8) on the base of J 24204-2 (10) so that the rear
of the housing is facing up. See Special Tools.
31. Align J-47339-2 (7) so that the bowl is facing down. See Special Tools.
32. Install J-47339-2 (7) onto the shaft of J 24204-2 and onto the inner hub of the 1-2-3-4, 4-5-
6 clutch housing (9). See Special Tools. Make sure the rim of J-47339-2 (7) almost touches
the retaining ring. See Special Tools.
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
33. Install the spring (5) of J-47339-1 onto the shaft of J 24204-2 . See Special Tools.
34. Install J-47339-1 (4) onto the shaft of J 24204-2 . See Special Tools.
35. Install the J 24204-2 ball bearing (3) and washer (2) onto the shaft of J 24204-2 . See
Special Tools.
36. Install the J 24204-2 wing nut (1) onto the shaft of J 24204-2 . See Special Tools.
37. Compress the 4-5-6 clutch piston return spring assembly until the retaining ring (6) can be
removed.
38. Remove the retaining ring (6) from the groove in the 1-2-3-4, 4-5-6 clutch housing inner hub
and move the retaining ring over the top of J-47339-2 (7). See Special Tools.
39. Remove all J tools from the 1-2-3-4, 4-5-6 clutch housing.
40. Remove the retaining ring (6) from the 1-2-3-4, 4-5-6 clutch housing.
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado