Chevrolet Silverado / GMC Sierra. Service manual — part 791

Fig. 151: Replacing 1-2-3-4 and 3-5 Reverse Clutch Piston Seals
Courtesy of GENERAL MOTORS CORP.

1-2-3-4 and 3-5 Reverse Clutch Piston Seals Replacement

Callout

Component Name

Preliminary Procedure: Lubricate all seals with automatic transmission fluid (ATF) prior
to installation.

NOTE:

Refer to Seal Reuse Notice .

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - 6L50/6L80/6L90 - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado

3-5 REVERSE CLUTCH PISTON INSTALLATION

Fig. 152: Installing 3-5 Reverse Clutch Piston

1

1-2-3-4 Clutch Piston Seal

2

3-5 Reverse Clutch Piston Dam (O-Ring) Seal

3

3-5 Reverse Clutch Piston Inner Seal

4

1-2-3-4 Clutch Piston Housing

5

3-5 Reverse Clutch Piston Outer Seal

6

3-5 Reverse Clutch Piston

7

1-2-3-4 Clutch Piston Inner Seal

NOTE:

Do not install a NEW 1-2-3-4 clutch piston inner
seal yet. A special tool used to install the 1-2-3-4
clutch piston housing retaining ring may damage
the seal if the seal is installed prior to installing the
retaining ring. Refer to 3-5 Reverse Clutch Piston
Installation.

8

1-2-3-4 Clutch Piston Housing Seal

9

1-2-3-4 Clutch Piston Housing Seal

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - 6L50/6L80/6L90 - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado

Courtesy of GENERAL MOTORS CORP.

3-5 Reverse Clutch Piston Installation

Callout

Component Name

1

3-5 Reverse Clutch Piston

2

3-5 Reverse Clutch Spring

NOTE:

Ensure the clutch spring is centered on the piston with
the tabs facing up. Failure to do so may cause damage
to the clutch assembly.

3

1-2-3-4 Clutch Piston Housing

4

1-2-3-4 Clutch Piston Housing Retaining Ring

Special Tools

DT 47782-1 Retaining Ring Cone. See
Special Tools.

DT 47782-2 Retaining Ring Installer. See
Special Tools.

NOTE:

Before using the DT 47782-2, push the retaining ring
over the DT 47782-1 by hand so that the ring is
positioned below the tapered area of the DT 47782-1. If
the ring is positioned above the tapered area when it is
being installed, the ring will become lodged between
both tools and damage to the tools, retaining ring, and
piston housing will result.

NOTE:

Refer to Retaining Ring Reuse Notice .

NOTE:

Push the retaining ring down over the cone until the
ring seats firmly in the retaining ring groove. The
retaining ring will make a distinctive click sound when
it seats. Failure to properly seat the retaining ring may
cause damage to the 3-5 reverse clutch assembly.

1-2-3-4 Clutch Piston Inner Seal

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - 6L50/6L80/6L90 - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado

1-2-3-4 CLUTCH PISTON INSTALLATION

Fig. 153: Installing 1-2-3-4 Clutch Piston
Courtesy of GENERAL MOTORS CORP.

5

NOTE:

Install a NEW seal and orientate as shown. Failure to
do so may cause internal transmission leaks and
damage to the transmission.

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - 6L50/6L80/6L90 - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado