Bulletin No.: 13430
Date: December 2013

Program Bulletin

CUSTOMER SATISFACTION PROGRAM
SUBJECT:

Pinion Nut Improperly Fastened

MODELS:

2014 Chevrolet Silverado 1500
2014 GMC Sierra 1500
Equipped with 3.73 Rear Axle Ratio (GT4) and Locking Rear Differential
(G80)

Vehicles involved in this program were placed on stop delivery November 27, 2013. Once the
service procedure contained in this bulletin has been performed on the vehicle, the vehicle is
released from stop delivery and the vehicle can be delivered to the customer.
All involved vehicles that are in dealer inventory must be held and not delivered to customers,
dealer traded, or used for demonstration purposes until the repair contained in this bulletin has
been performed on the vehicle.

THIS PROGRAM IS IN EFFECT UNTIL DECEMBER 31, 2015.
CONDITION
Certain 2014 model year Chevrolet Silverado and GMC Sierra 1500 vehicles, equipped with a
3.73 rear axle ratio (GT4) and locking rear differential (G80), may have a rear axle pinion nut
that is improperly fastened. This could cause a gear whine, clicking, grinding, or a moan noise
from the rear axle.
CORRECTION
Dealers are to refasten the pinion nut.
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
Copyright 2013 General Motors. All Rights Reserved.

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Bulletin No.: 13430

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, or
sent directly to export dealers. 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.
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.
Part Number
23107857*
92230391**

Description
RETAINER, FRT PROP SHF
NUT, DIFF DRV P/GR

Quantity/Vehicle
2 (if req'd)
1 (if req'd)

* Retainer required only when the propeller shaft is removed. Do NOT order this part unless the
propeller shaft has been removed.
** Order a new pinion nut if it is damaged during the staking procedure.
SERVICE PROCEDURE
Note: The purpose of this program is to manually stake the drive pinion nut; however, if a
customer comments about rear axle noise, root cause the condition using diagnostic and repair
information in SI. Submit a claim under warranty, if applicable, for diagnostic and repair time.
1. Place transmission gear selector in ‘N’ neutral.
2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in SI.
3. Determine if there is access to manually stake the two sides of the drive pinion nut lip to the
corresponding grooves in the drive pinion gear without disconnecting the propeller shaft from
the axle flange. A hammer and punch are required to manually stake the two sides of the
drive pinion nut lip to the corresponding grooves in the drive pinion gear.


If there is access to manually stake the two sides of the drive pinion nut lip to the
corresponding grooves in the drive pinion gear WITHOUT disconnecting the propeller
shaft from the axle flange, proceed to step 4.



If there is NOT access to manually stake the two sides of the drive pinion nut lip to the
corresponding grooves in the drive pinion gear, reference mark the rear propeller shaft to
the rear axle pinion yoke BEFORE disconnecting the propeller shaft from the axle flange.
Secure the end of the propeller shaft with a strap after disconnecting the propeller shaft
from the axle flange. Proceed to step 4.

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Bulletin No.: 13430

3661113

Note: A 5 mm (0.197 in) wide punch with a 1.8 mm (0.070 in) radius end must be used to
complete step 4. Modify a 5 mm (0.197 in) wide punch to include a 1.8 mm (0.070 in) radius
end.

3661112

(A) No Staking (B) Acceptable Staking
Caution: Take care to not split the pinion nut lip. Splitting the pinion nut lip may affect pinion nut
torque retention. Replace the pinion nut if the lip is split.
4. Determine if the drive pinion nut lip (1) has been manually staked to the corresponding
grooves in the drive pinion gear.


If the drive pinion nut lip (1) has NOT been staked, use a hammer and 5 mm (0.197 in)
wide punch with a 1.8 mm (0.070 in) radius end to manually stake the two sides of the
drive pinion nut lip (1) to the corresponding grooves in the drive pinion gear.



If the drive pinion nut lip (1) has been staked, use the punch to further stake the pinion
nut into the two grooves.

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Bulletin No.: 13430

5. After staking the pinion nut lip to the corresponding grooves in the drive pinion gear, proceed
to step 6 if the propeller shaft was NOT disconnected from the axle flange and step 7 if the
propeller shaft was disconnected from the axle flange.
6. Lower the vehicle. Refer to Lifting and Jacking the Vehicle in SI.
Caution: New propeller shaft straps are required if the propeller shaft was removed. The
propeller strap bolts may be reused. Tighten bolts to 25 Nm (18 lb-ft). Refer to the rear propeller
shaft-to- rear axle pinion yoke reference marks when installing the propeller shaft.
7. Unstrap the rear propeller shaft and install the propeller shaft. Refer to the appropriate
propeller shaft replacement procedure in SI.
FLOOR PLAN REIMBURSEMENT
Dealers in possession of vehicles included in the Stop Delivery are eligible for reimbursement of
floor plan expense upon completion of this program. This reimbursement is limited to the
number of days from the Stop Delivery message to receipt of the program parts and/or repair
procedures. Floor plan reimbursement beyond these dates is not allowed. The amount of
reimbursement should be charged as a net amount expense using the program labor operation
provided.
COURTESY TRANSPORTATION – For US and Canada
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.

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Bulletin No.: 13430

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
9100291
9100292
9100293

Description
Stake Pinion Nut
Modify Punch Service Tool (one-time charge per dealership)
Floor Plan Reimbursement

Labor
Time
0.4
0.2
N/A

Net
Item
N/A
*
**

*

The amount identified in “Net Item” should represent the actual cost for the 5mm punch
needed to perform the required repairs, not to exceed $10.00.

**

The amount identified in “Net Item” should represent the product of the vehicle’s average
daily interest rate (see table below) multiplied by the actual number of days the vehicle was
in dealer inventory and not available for sale. This reimbursement is limited to the number
of days from the date of the stop delivery message (November 27, 2013) to the date the
repair is completed and the vehicle is ready for sale (not to exceed 15 days):
Vehicle

US
Reimbursement Amount

Canadian
Reimbursement Amount

Chevrolet Silverado

$5.66

$6.71

GMC Sierra

$5.94

$6.71

CUSTOMER NOTIFICATION – For US and Canada
General Motors will notify customers of this program on their vehicle (see copy of customer
letter included with this bulletin).
CUSTOMER NOTIFICATION – For Export
Letters will be sent to known owners of record located within areas covered by the US National
Traffic and Motor Vehicle Safety Act. For owners outside these areas, dealers should notify
customers using the attached sample letter.
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 December 31, 2015.
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.

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Bulletin No.: 13430

In summary, whenever a vehicle subject to this program enters your vehicle inventory, or is in
your facility for service through December 31, 2015, 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

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Bulletin No.: 13430

Dear General Motors Customer:
We have learned that your 2014 model year Chevrolet Silverado or GMC Sierra vehicle,
equipped with a 3.73 rear axle ratio and locking rear differential, may have a rear axle pinion nut
that is improperly fastened. This could cause a gear whine, clicking, grinding, or a moan noise
from the rear axle.
Your satisfaction with your vehicle is very important to us, so we are announcing a program to
correct this condition.
What We Will Do: Your GM dealer will refasten the pinion nut. This service will be performed
for you at no charge until December 31, 2015. 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.
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
13430