Bulletin No.: 14043
Date: March 2014

Program Bulletin

CUSTOMER SATISFACTION PROGRAM
SUBJECT:

Incorrect Transmission Thrust Bearing

MODELS:

2012 Chevrolet Silverado HD
2012 GMC Sierra HD
Equipped with Allison 6-Speed Automatic Transmission (MW7)

THIS PROGRAM IS IN EFFECT UNTIL MARCH 31, 2016.
CONDITION
Certain 2012 Chevrolet Silverado and GMC Sierra HD vehicles, equipped with an Allison 6-speed
automatic transmission (MW7), may have been built with an incorrect transmission thrust bearing.
Over time, this bearing could fail, resulting in noise and poor transmission operation.
CORRECTION
Dealers are to replace the thrust bearing.
VEHICLES INVOLVED
All involved vehicles are identified by Vehicle Identification Number on the Investigate Vehicle
History screen in GM Global Warranty Management system. Dealership service personnel
should always check this site to confirm vehicle involvement prior to beginning any required
inspections and/or repairs. It is important to routinely use this tool to verify eligibility because not
all similar vehicles may be involved regardless of description or option content.
For dealers with involved vehicles, a listing with involved vehicles containing the complete vehicle
identification number, customer name, and address information has been prepared and will be
provided to US and Canadian dealers through the GM GlobalConnect Recall Reports. Dealers
will not have a report available if they have no involved vehicles currently assigned.
The listing may contain customer names and addresses obtained from Motor Vehicle Registration
Records. The use of such motor vehicle registration data for any purpose other than follow-up
necessary to complete this program is a violation of law in several states/provinces/countries.
Accordingly, you are urged to limit the use of this report to the follow-up necessary to complete
this program.
Copyright 2014 General Motors. All Rights Reserved.

Page 2

March 2014

Bulletin No.: 14043

PART INFORMATION
Parts required to complete this program are to be obtained from General Motors Customer Care
and Aftersales (GMCC&A). Please refer to your “involved vehicles listing” before ordering parts.
Normal orders should be placed on a DRO = Daily Replenishment Order. In an emergency
situation, parts should be ordered on a CSO = Customer Special Order.
Note: Due to the small number of vehicles involved, dealers should not order parts for use
as shelf stock. Parts should only be ordered by dealers who have involved vehicles
assigned to them.
Part Number
29531106
29531325
29536941
88861037 - US
19264717 - CN
88996648
29536834
15126137
11561618
29547443
24263164
22913281
15898003
11611401

Description
BEARING, INPUT CARR THR
GASKET, PTO CVR
GASKET, A/TRNS CASE EXTN

Quantity/Vehicle
1
1
1

FLUID, A/TRANS(DEXRON VI, 1 QT)

12

RETAINER, TRANS FLUID CLR PIPE CONN
SEAL, TRANS FLUID FIL TUBE
GASKET, CTLTC CONV
BOLT, TRANS MT (2WD)
NUT, OUTPUT SHF RET (4WD)
GASKET, TRFER CASE ADAP (4WD)
CLAMP, PROP SHF SLIP YOKE BOOT
RING, PROP SHF UJT SPIDER BRG RET (4WD)
BOLT, TRANS MT (4WD)

2
1
1
2
1
1
2
4
2

Page 3

March 2014

Bulletin No.: 14043

SERVICE PROCEDURE

3723744

Caution: Installing the thrust bearing incorrectly may cause permanent damage to the
transmission.
1.

Align the thrust bearing (1) so that the black oxide surface on the thrust bearing is facing
up, away from the input carrier module (2).

2.

Install the thrust bearing (1) onto the input carrier module (2).

Note: Remove the low and reverse clutch housing – 4WD using the same procedure as when
removing a low and reverse clutch housing – 2WD.
Note: Do not attempt to replace the low and reverse clutch housing with the transmission in the
vehicle. Several internal components are held in place by the housing and they will come out of
alignment during reassembly. Attempting to do so will result in the following conditions:


Displacement of eighteen (18) clutch springs



Damage to C5 clutch plates



Damage to P2 & P3 thrust bearings



Improper transmission end play



Shop comebacks

1.

Remove the transmission from the vehicle.

2.

Remove the intermediate carrier and main shaft from the transmission to gain access to the
thrust bearing assembly. Remove and replace the thrust bearing. Refer to the following
service procedures in SI to perform this repair.


Low and Reverse Clutch Piston and Output Carrier Assembly Removal



Intermediate Carrier and Main Shaft Removal



Input Carrier Assembly and 2-6 Clutch Installation

Page 4

March 2014

Bulletin No.: 14043

COURTESY TRANSPORTATION
The General Motors Courtesy Transportation program is intended to minimize customer
inconvenience when a vehicle requires a repair that is covered by the New Vehicle Limited
Warranties. The availability of courtesy transportation to customers whose vehicles are within the
warranty coverage period and involved in a product program is very important in maintaining
customer satisfaction. Dealers are to ensure that these customers understand that shuttle service
or some other form of courtesy transportation is available and will be provided at no charge.
Dealers should refer to the General Motors Service Policies and Procedures Manual for Courtesy
Transportation guidelines.
WARRANTY TRANSACTION INFORMATION
Submit a transaction using the table below. All transactions should be submitted as a ZFAT
transaction type, unless noted otherwise.
Labor
Code
9100370

Description
Thrust Bearing Replacement
- 2WD
- 4WD

Labor
Time
6.5
7.1

CUSTOMER NOTIFICATION
General Motors will notify customers of this program on their vehicle (see copy of customer letter
included with this bulletin).
DEALER PROGRAM RESPONSIBILITY
All unsold new vehicles in dealers' possession and subject to this program must be held and
inspected/repaired per the service procedure of this program bulletin before customers take
possession of these vehicles.
Dealers are to service all vehicles subject to this program at no charge to customers, regardless
of mileage, age of vehicle, or ownership, through March 31, 2016.
Customers who have recently purchased vehicles sold from your vehicle inventory, and for which
there is no customer information indicated on the involved vehicle listing, are to be contacted by
the dealer. Arrangements are to be made to make the required correction according to the
instructions contained in this bulletin. A copy of the customer letter is provided in this bulletin for
your use in contacting customers. Program follow-up cards should not be used for this purpose,
since the customer may not as yet have received the notification letter.
In summary, whenever a vehicle subject to this program enters your vehicle inventory, or is in your
facility for service through March 31, 2016, you must take the steps necessary to be sure the
program correction has been made before selling or releasing the vehicle.

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that
may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the tools,
equipment, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to
your vehicle, or that your vehicle will have that condition. See your dealer for information on whether your vehicle may benefit from the information.

We Support
Voluntary Technician
Certification

Page 5

March 2014

Bulletin No.: 14043
March 2014

Dear General Motors Customer:
We have learned that your 2012 model year Chevrolet Silverado HD or GMC Sierra HD vehicle,
equipped with an Allison 6-speed automatic transmission, may have been built with an incorrect
transmission thrust bearing. Over time, this bearing could fail, resulting in noise and poor
transmission operation.
Your satisfaction with your Silverado HD or Sierra HD is very important to us, so we are
announcing a program to prevent this condition or, if it has occurred, to fix it.
What We Will Do: Your GM dealer will replace the thrust bearing. This service will be
performed for you at no charge until March 31, 2016. After that, any applicable warranty will
apply.
What You Should Do: To limit any possible inconvenience, we recommend that you contact
your dealer as soon as possible to schedule an appointment for this repair. By scheduling an
appointment, your dealer can ensure that the necessary parts will be available on your
scheduled appointment date.
If you have any questions or concerns that your dealer is unable to resolve, please contact the
appropriate Customer Assistance Center at the number listed below.
Division

Number

Chevrolet
GMC
Guam
Puerto Rico – English
Puerto Rico – Español
Virgin Islands

1-800-222-1020
1-800-462-8782
65-6267-1752
1-800-496-9992
1-800-496-9993
1-800-496-9994

Text Telephones
(TTY)
1-800-833-2438
1-888-889-2438

Courtesy Transportation: If your vehicle is within the New Vehicle Limited Warranty, your
dealer may provide you with shuttle service or some other form of courtesy transportation while
your vehicle is at the dealership for this repair. Please refer to your Owner Manual and your
dealer for details on Courtesy Transportation.
We sincerely regret any inconvenience or concern that this situation may cause you. We want
you to know that we will do our best, throughout your ownership experience, to ensure that your
GM vehicle provides you many miles of enjoyable driving.
Jim Moloney
General Director,
Customer and Relationship Services
14043