GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2009 🢒 CTS 🢒 Transmission 🢒 Automatic Transmission - 6L50/6L80/6L90 🢒 Low and Reverse Clutch Overhaul

Low and Reverse Clutch Overhaul 6L90

Table 1: Low and Reverse Clutch Plate Removal
Table 2: Low and Reverse Clutch Piston Removal
Table 3: Low and Reverse Clutch Piston Installation
Table 4: Low and Reverse Clutch Plate Installation

Low and Reverse Clutch Plate Removal
Object Number: 1822773 Size: MF

Low and Reverse Clutch Plate Removal

Callout

Component Name

1

Low and Reverse Clutch Backing Plate Retaining Ring

2

Low and Reverse Clutch Backing Plate

3

Low and Reverse Clutch Plate Assembly (Qty: 6)

4

Low and Reverse Clutch Plate (Qty: 6)

5

Low and Reverse Clutch (Waved) Plate

Low and Reverse Clutch Piston Removal
Object Number: 1555313 Size: MF

Low and Reverse Clutch Piston Removal

Callout

Component Name

1

Low and Reverse Clutch Spring Retaining Ring

Caution: Ensure the DT 47779 contacts the sprag assembly and not the sprag retaining ring. Damage to the sprag may result.

Special Tool

DT 47779 Clutch Spring Compressor

For equivalent regional tools, refer to Special Tools.

2

Low Clutch Sprag Assembly

3

Low and Reverse Clutch Spring

4

Low and Reverse Clutch Piston Assembly

Tip
It may be necessary to apply air to the apply passage in order to unseat the piston.

5

Low Clutch Sprag Seal

Caution: Refer to Seal Reuse Caution in the Preface section.

Low and Reverse Clutch Piston Installation
Object Number: 1555316 Size: MF

Low and Reverse Clutch Piston Installation

Callout

Component Name

1

Low and Reverse Clutch Piston Assembly

Tip
Lubricate the inner and outer sealing surfaces of the piston assembly with automatic transmission fluid (ATF) in order to ease installation into the center support assembly.

2

Low Clutch Sprag Seal

Caution: Refer to Seal Reuse Caution in the Preface section.

Tip
Apply ATF to the DT 47780 low clutch sprag seal cone to ease seal installation.

Special Tool

DT 47780 Low Clutch Sprag Seal Cone

For equivalent regional tools, refer to Special Tools.

3

Low and Reverse Clutch Spring

Caution: Ensure the spring tabs are facing up during installation. Failure to do so may cause damage to the clutch assembly.

4

Low Clutch Sprag Assembly

Tip

    • Verify that the low clutch sprag is operating correctly. Refer to the illustration for proper freewheel direction.
    • Ensure the missing splines on the sprag assembly are aligned with the missing splines on the center support hub.

5

Low and Reverse Clutch Spring Retaining Ring

Caution: Ensure the DT 47779 contacts the sprag assembly and not the sprag retaining ring. Damage to the sprag may result.

Caution: The retaining ring gap must be aligned with the 3 missing splines on the center support hub. Failure to do so may cause damage to the clutch assembly.

Special Tools

    • DT 47778-1 Low Clutch Sprag Retaining Ring Cone
    • DT 47778-2 Low Clutch Sprag Retaining Ring Pusher
    • DT 47779 Clutch Spring Compressor

For equivalent regional tools, refer to Special Tools.

Low and Reverse Clutch Plate Installation
Object Number: 1822775 Size: MF

Low and Reverse Clutch Plate Installation

Callout

Component Name

1

Low and Reverse Clutch (Waved) Plate

2

Low and Reverse Clutch Plate (Qty: 6)

3

Low and Reverse Clutch Plate Assembly (Qty: 6)

4

Low and Reverse Clutch Backing Plate

5

Low and Reverse Clutch Backing Plate Retaining Ring

Tip
Apply air to verify proper installation of all low and reverse clutch components.

Low and Reverse Clutch Overhaul 6L50

Table 1: Low and Reverse Clutch Plate Removal
Table 2: Low and Reverse Clutch Piston Removal
Table 3: Low and Reverse Clutch Piston Installation
Table 4: Low and Reverse Clutch Plate Installation

Low and Reverse Clutch Plate Removal
Object Number: 1748746 Size: MF

Low and Reverse Clutch Plate Removal

Callout

Component Name

1

Low and Reverse Clutch Backing Plate Retaining Ring

2

Low and Reverse Clutch Backing Plate

3

Low and Reverse Clutch Plate Assembly (Qty: 6)

4

Low and Reverse Clutch Plate (Qty: 6)

5

Low and Reverse Clutch (Waved) Plate

Low and Reverse Clutch Piston Removal
Object Number: 1748747 Size: MF

Low and Reverse Clutch Piston Removal

Callout

Component Name

1

Low and Reverse Clutch Spring Retaining Ring

Caution: DT-49122 must be used with the DT-48069 in order to prevent damage to the low clutch sprag retainer.

Special Tool

    • DT-48069 Low Clutch Spring Compressor
    • DT-49122 Low Clutch Spring Compressor Adapter

For equivalent regional tools, refer to Special Tools.

2

Low Clutch Sprag Assembly

3

Low and Reverse Clutch Spring

4

Low and Reverse Clutch Piston Assembly

Tip
It may be necessary to apply air to the apply passage in order to unseat the piston.

5

Low Clutch Sprag Seal

Caution: Refer to Seal Reuse Caution in the Preface section.

Low and Reverse Clutch Piston Installation
Object Number: 1748748 Size: MF

Low and Reverse Clutch Piston Installation

Callout

Component Name

1

Low and Reverse Clutch Piston Assembly

Tip
Lubricate the inner and outer sealing surfaces of the piston assembly with automatic transmission fluid (ATF) in order to ease installation into the center support assembly.

2

Low Clutch Sprag Seal

Caution: Refer to Seal Reuse Caution in the Preface section.

Tip
Apply ATF to the DT-48070 low clutch sprag seal cone to ease seal installation.

Special Tool

DT-48070 Low Clutch Sprag Seal Cone

For equivalent regional tools, refer to Special Tools.

3

Low and Reverse Clutch Spring

Caution: Ensure the spring tabs are facing up during installation. Failure to do so may cause damage to the clutch assembly.

4

Low Clutch Sprag Assembly

Tip

    • Verify that the low clutch sprag is operating correctly. Refer to the illustration for proper freewheel direction.
    • Ensure the missing splines on the sprag assembly are aligned with the missing splines on the center support hub.

5

Low and Reverse Clutch Spring Retaining Ring

Caution: DT-49122 must be used with the DT-48069 in order to prevent damage to the low clutch sprag retainer.

Caution: The retaining ring gap must be aligned with the 3 missing splines on the center support hub. Failure to do so may cause damage to the clutch assembly.

Special Tools

    • DT-48068-1 Low Clutch Sprag Retaining Ring Cone
    • DT-48068-2 Low Clutch Sprag Retaining Ring Pusher
    • DT-48069 Low Clutch Spring Compressor
    • DT-49122 Low Clutch Spring Compressor Adapter

For equivalent regional tools, refer to Special Tools.

Low and Reverse Clutch Plate Installation
Object Number: 1748750 Size: MF

Low and Reverse Clutch Plate Installation

Callout

Component Name

1

Low and Reverse Clutch (Waved) Plate

2

Low and Reverse Clutch Plate (Qty: 6)

3

Low and Reverse Clutch Plate Assembly (Qty: 6)

4

Low and Reverse Clutch Backing Plate

Tip
Install the backing plate with the inner step side up.

5

Low and Reverse Clutch Backing Plate Retaining Ring

Tip
Apply air to verify proper installation of all low and reverse clutch components.