2010 Cadillac Truck Escalade EXT AWD V8-6.2L Technical Service Bulletin # 08-07-30-006A Date: 091013

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Technical Service Bulletin # 08-07-30-006A Date: 091013

A/T - Valve Body Reconditioning Info.

INFORMATION

Bulletin No.: 08-07-30-006A

Date: October 13, 2009

Subject: HYDRA-MATIC(R) 6L45 (MYA), 6L50 (MYB), 6L80 (MYC) and 6L90 (MYD), Rear Wheel Drive Automatic Transmission Control

Valve Body Assembly Reconditioning

Models:

2006-2009 Cadillac XLR

2006-2010 Cadillac STS

2007-2009 Cadillac SRX

2007-2010 Cadillac Escalade, Escalade ESV, Escalade EXT

2008-2010 Cadillac CTS

2006-2010 Chevrolet Corvette

2007-2010 Chevrolet Silverado

2008-2010 Chevrolet Suburban

2009-2010 Chevrolet Avalanche, Tahoe

2007-2010 GMC Sierra, Sierra Denali, Yukon Denali, Yukon Denali XL

2008-2010 GMC Yukon XL

2009-2010 GMC Yukon

2008-2009 Pontiac G8

2008-2009 HUMMER H2

with 6L45, 6L50, 6L80 or 6L90 HYDRA-MATIC(R) Rear Wheel Drive Automatic Transmission (RPOs MYA, MYB, MYC, MYD)

Supercede:

This bulletin is being revised to update model years and add 6L45 transmission (RPO MYA). Please discard Corporate Bulletin Number

08-07-30-006 (Section 07 - Transmission/Transaxle).

The information outlined in this bulletin is designed to provide easy to follow control valve body reconditioning instructions using the new

illustrations to simplify reassembly of the 6L45, 6L50, 6L80 and/or 6L90 automatic transmission control valve body assembly.

Caution

Valve springs can be tightly compressed. Use care when removing retainers and plugs. Personal injury could result.

Notice

After cleaning the transmission components, allow to air dry. Do not use cloth or paper towels in order to dry any transmission components. Lint

from the towels can cause component failure.

Notice

Do not reuse cleaning solvents. Previously used solvents may deposit sediment, which may damage the component.

Inspection Procedure for Shift Concerns

1. Using the exploded view, inspect each bore for freedom of valve(s) movement and evidence of debris. Pay particular attention to those valves

related to the customer's concern. IF VALVE BODY CLEANING IS NOT REQUIRED, DO NOT DISASSEMBLE THE BORES

UNLESS IT IS NECESSARY TO VERIFY MOVEMENT.

2. Verify movement of the valves in their normal installed position. Valves may become restricted during removal or installation. This is normal

due to small tolerances between the valves and bores.

3. If a valve is restricted and cannot be corrected by cleaning the valve and bore, replace the valve body. Describe the restricted valve on the

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 258

repair order.

Disassembly/Reassembly for Cleaning Debris

1. If a valve is restricted by a metal burr from machining that bore, remove the valve and burr. Inspect the movement in the valve's normal

position. If no other debris or restrictions are found, reassemble the valve body and install in the transmission.

2. If the valve body has been contaminated with debris from another transmission component failure, disassemble all bores for complete

cleaning of all valve body components. Keeping individual bore parts separated will make reassembly easier. Use the following illustrations

for positive identification and location of individual parts.

3. Using GM Brake Clean, or equivalent, in a safe and clean environment (clean aluminum pan), clean the valve body and dry it with

compressed air. Use appropriate eye protection.

4. Clean individual valve body components with GM Brake Clean, or equivalent. Coat each valve with clean ATF and reassemble in each bore.

Check each valve for free movement during assembly of each bore.

Important

Position the valve body as shown in the following illustrations for positive identification and location of individual parts.

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 259

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 260

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 261

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 262

Control Valve Body Spring, Bolt, Bore Plug and Retainer Identification Chart (Metric)

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 263

Control Valve Body Spring, Bolt, Bore Plug and Retainer Identification Chart (Inch)