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2016 Corvette: Service Bulletin: Delayed Engagement After Sitting With Engine Off

#16-NA-014: Delayed Engagement After Sitting With Engine Off - (Jan 21, 2016)

Subject Delayed Engagement After Sitting With Engine Off  
Attention This Bulletin also applies to any of the models that may be Export vehicles.

Brand:

Model:

Model Year:

VIN:

Engine:

Transmission:

from

to

from

to

Cadillac

Escalade

2015

2016

     

8L45 or 8L90

Cadillac

Escalade ESV

2015

2016

     

8L45 or 8L90

Cadillac

ATS

2016

2016

     

8L45 or 8L90

Cadillac

CTS

2016

2016

     

8L45 or 8L90

Chevrolet

Corvette

2015

2016

     

8L45 or 8L90

Chevrolet

Silverado

2015

2016

     

8L45 or 8L90

GMC

Sierra

2015

2016

     

8L45 or 8L90

GMC

Yukon

2015

2016

     

8L45 or 8L90

GMC

Yukon XL

2015

2016

     

8L45 or 8L90

 

Condition

Some customers may comment on a condition of delayed engagement when the transmission is shifted from Park to Reverse or Park to Drive after the vehicle has been sitting with the engine off. This condition may typically occur after several hours or more commonly overnight.

Customers may describe this condition as the vehicle not wanting to move or feeling like the transmission is slipping when first trying to move the vehicle. Operation will be normal and the condition will not occur until the vehicle sits again with the engine off for several hours or overnight.

Correction

Install a new stator shaft support assembly that includes an additional check ball. Follow the instructions below to replace the stator shaft support assembly.

Service Procedure
    1. Remove the transmission from the vehicle and mount to the DT-48989 transmission holding fixture. Refer to Transmission Replacement in SI.
    2. Remove the 15 bolts (1) securing the fluid pan and gasket to the transmission.
2016 Corvette Transmission

Note: The fluid pan gasket is reusable. Inspect the gasket to determine if it may be reused. If the gasket is stuck to the case or pan, it should be replaced.

    1. Remove the fluid pan (2) and gasket (3). The fluid filter does not need to be removed.
2016 Corvette Transmission
    1. Using the DT-48285 Torx Plus socket, remove the two fluid baffle bolts (1) and fluid baffle (2). Discard the bolts.

Note: The driven sprocket locking tab is located on the back of the sprocket. Rotate the sprocket as shown and simultaneously pull back and up on the tab to release the retainer.

    1. Remove the driven sprocket (3) from the oil pump shaft leaving the drive link (chain) loose in the case.
2016 Corvette Transmission
    1. Remove the 11 front cover bolts (1). Discard the bolts. The bolts have a dry sealant on them and may only be used once.

Note: There are 2 different front cover configurations. Early design front covers have 3 threaded holes for service, late design front covers have 2 threaded holes.

  • Use two GE-6125-1B slide hammers and DT-51791 slide hammer adapters in the threaded holes of the front cover to remove it from the case for applications with 3 threaded holes.
  • Use the GE-8433 puller bar and 2 bolts in the threaded holes of the front cover to remove it from the case for applications with 2 threaded holes.
    1. Remove the front cover (2) and seal (3). Inspect the seal and replace if worn or damaged.
    2. Remove the drive sprocket (5).
    3. Remove the drive link assembly (6).
    4. Remove the front support cover gasket (8). Discard the gasket.
    5. Inspect the front (4) and rear (7) drive sprocket thrust washers. Replace if worn or damaged.
2016 Corvette Transmission
    1. Remove the turbine shaft O-ring seal (1). Discard the seal.
    2. Remove the nine stator shaft support bolts (2).
    3. Remove the stator shaft support assembly (3).
      2016 Corvette Transmission

      2016 Corvette Transmission
      (A) Old stator support asm 24274636/24275106/24272656
      (B) New stator support asm 24277234

      Note: The new stator shaft support assembly has a second check ball (1) added (see illustrations).

2016 Corvette Transmission

Caution: Size the converter fluid seal ring for at least 5 minutes after installation to obtain proper seal ring size. Failure to do so may cause internal transmission leaks and transmission damage.

Note: Use the large taper side of DT-50912-1 Seal Sizer for initial seal sizing, then flip the tool over for final sizing. The DT-50912-1 seal sizer works for both the 8L90 and 8L45.

    1. Using the DT-50912 Seal Installer (8L90) or DT-51196 Seal Installer (8L45), install a NEW torque converter fluid seal (1) on the stator shaft support assembly. Size the seal using the DT-50912-1 Seal Sizer.
    2. Install 2 NEW 1-3-5-6-7 Clutch Fluid Seal Rings (2).
2016 Corvette Transmission

Note: Align the bolt hole indicated by the arrow with the arrow that is cast into the case and push down to seat.

    1. Install the NEW stator shaft support assembly (1).
    2. Install the nine stator shaft support bolts (2). Tighten the bolts in the sequence shown. Tighten the bolts to 31 Y (23 lb ft).
    3. Install a NEW turbine shaft O-ring seal (3).
      2016 Corvette Transmission
      (A) Old cover 24272660
      (B) New cover 24277964

      Note: The casting void has been eliminated from the underside of the cover (see illustration).

2016 Corvette Transmission
    1. Using the DT-43772 Torque Converter Seal Installer, install a NEW torque converter fluid seal (1) on the front cover.

2016 Corvette Transmission
    1. Install a NEW front support cover gasket (1).
    2. Install the (rear) drive sprocket thrust washer (2) on the stator shaft support assembly.
    3. Install the drive sprocket (3) and drive link assembly (4).
    4. Install the (front) support cover gasket (5) on the front cover (7).
    5. Install the front cover seal (6) on the front cover (7).

Note: Ensure the drive link assembly is not pinched by the front cover and moves freely on the drive sprocket.

    1. Install the front cover (7).
    2. Install the 11 NEW front cover bolts (8). Gradually tighten the bolts in the sequence shown. Tighten the bolts a first pass to 6.5 Y (58 lb in). Tighten the bolts a final pass 30 Degrees.

      2016 Corvette Transmission

      Note: Ensure the driven sprocket locking tab is in the unlocked position before installing the sprocket. The driven sprocket locking tab is located on the back of the sprocket and faces the pump.

    3. Install the drive link (chain) to the driven sprocket (1) and then install the driven sprocket to the oil pump shaft. Rotate the sprocket as shown and push down on the tab until it locks the driven sprocket in place.
    4. Install the fluid baffle (2).
    5. Using the DT-48285 Torx Plus socket, secure the baffle using two NEW fluid baffle bolts (3). Tighten the bolts a first pass to 4 Y (35 lb in). Tighten the bolts a final pass to 45 degrees.

2016 Corvette Transmission
  1. Install the fluid pan and gasket and secure with 15 bolts. Tighten the bolts to 10 Y (89 lb in) in the sequence shown.
  2. Install the transmission into the vehicle. Refer to Transmission Replacement in SI.
Parts Information

Description

Part Number

Qty

Trans Model

Component Number in Disassembled Views

GASKET-A/TRNS FLUID PAN

24260071

1 (if required)

8L45/8L90

48

BOLT/SCREW-A/TRNS FLUID BFL

11548404

2

8L45/8L90

12

BOLT/SCREW-A/TRNS CASE FRT CVR

11548201

11

8L45/8L90

3

SEAL-A/TRNS CASE FRT CVR

24266366

1 (if required)

8L90

5

SEAL-A/TRNS CASE FRT CVR

24251906

1 (if required)

8L45

5

GASKET-A/TRNS FRT SUPT CVR

24272658

1

8L90

19

GASKET-A/TRNS FRT SUPT CVR

24264863

1

8L45

19

WASHER-DRV SPKT THR (FRONT)

24259119

1 (if required)

8L45/8L90

6

WASHER-DRV SPKT THR (REAR)

24259427

1 (if required)

8L45/8L90

8

SEAL-TURB SHF (O RING)

24261849 (Part of 24271697 kit)

1

8L90

500

SEAL-TURB SHF (O RING)

24261848 (Part of 24277071 kit)

1

8L45

500

SUPPORT ASM-STATOR SHF

24277234

1

8L90

14

SUPPORT ASM-STATOR SHF

24277230

1

8L45

14

COVER-A/TRNS CASE FRT

24277964

1 (if required)

8L90

4

SEAL-T/CV FLUID

24259216

1

8L45/8L90

18

RING-1-3-5-6-7 CLU FLUID SEAL

24266593

2

8L90

15

RING-1-3-5-6-7 CLU FLUID SEAL

24266594

2

8L45

15

SEAL ASM-T/CV FLUID

24266709

1

8L45/8L90

2

FLUID, A/TRANS (DEXRON HP ATF) (1 QUART)

19300536-US

19300537-CA

As Required

8L45/8L90

 
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