Chevrolet Silverado / GMC Sierra. Manual — part 978

21. Make sure J 24204-2 does not touch the gear thrust plate rivets (6) on the 3rd, 5th, and

reverse clutch backing plate assembly. See Special Tools.

22. Compress the piston return spring assemblies (5) until the retaining ring groove is visible.

23. Install the 2-6 clutch retaining ring (4).

24. Install the low and reverse clutch retaining ring (3) with the retaining ring gap 180 degrees

from the 2-6 clutch retaining ring gap.

25. Remove J 24204-2 and J 44530 from the transmission case. See Special Tools.

LOW AND REVERSE CLUTCH STEEL PLATE SELECTION

Tools Required

J 24204-2 Bar and Stud Assembly. See Special Tools.

J 44530 Clutch Piston Spring Compressor. See Special Tools.

Selection

IMPORTANT: The outer 2-6 clutch retaining ring is thinner and larger in

circumference compared to the inner low and reverse clutch
retaining ring.

IMPORTANT: Position the 2-6 clutch and the low and reverse clutch

retaining ring gaps 180 degrees apart.

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

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

Fig. 466: View Of Low And Reverse Clutch Backing Plate
Courtesy of GENERAL MOTORS CORP.

IMPORTANT: The low and reverse clutch backing plate installs in either

direction. The plate may have no grooves, one side grooved,
or both sides grooved.

2008 Chevrolet Silverado 1500

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

Silverado

1. Install the low and reverse clutch backing plate (3).

2. Starting with a low and reverse clutch fiber plate, alternately install the remaining 5 low and

reverse clutch fiber plates (2) and the low and reverse clutch steel plates (1).

IMPORTANT: The low and reverse clutch pack uses a single selective steel

plate. The low and reverse clutch pack is stacked out of
order to allow determining the required selective steel plate
part number. When properly stacked, the top plate is a steel
plate and the next 2 plates are fiber plates. The selective
steel plate is not stacked. Steel plates have an ID number
stamped on a tang. The identification number that does not
match the other identification numbers is the selective steel
plate.

2008 Chevrolet Silverado 1500

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

Silverado

Fig. 467: Cross Sectional View Of Low And Reverse Clutch Stack
Courtesy of GENERAL MOTORS CORP.

3. Install J 24204-2 (3) and J 44530 (1) into the transmission case. See Special Tools.

4. Make sure J 24204-2 does not damage the gear thrust plate rivets (4) on the 3rd, 5th, and

reverse clutch backing plate assembly. See Special Tools.

NOTE:

Refer to 3-5 Reverse Clutch Backing Plate Rivet Damage
Notice .

2008 Chevrolet Silverado 1500

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

Silverado