23-NA-029

Service Bulletin
Bulletin No.:
23-NA-029
Date:
April, 2023
TECHNICAL
Subject:
Brand:
Cadillac
Chevrolet
GMC
Transmission Grinds When Put Into Gear, Slipping, No Movement When Shifted Into
Drive or Reverse
Model:
Model Year:
from
to
VIN:
from
to
Engine:
Transmission:
XT5
M3W
XT6
Blazer
2023
2023
LGX, LFY
Traverse
Acadia
M3V
M3W
Involved Region or Country
North America, Europe, Uzbekistan, Middle East, Israel, Palestine, Bolivia (West), Chile
(West), Colombia (West), Ecuador (West), Peru (West), Cadillac Korea (South Korea),
Egypt
Condition
Some customers may comment on one or more of the following conditions:
• Grinding noise
• Transmission slipping
• No movement when shifted in drive or reverse
Cause
This condition may be caused by the left side axle (driver's side axle) is not fully seated in
the transmission.
Correction
Remove the transmission from the vehicle and replace the front differential carrier sun
gear and the left axle shaft following SI published procedures.
Important: Service agents must comply with all
International, Federal, State, Provincial, and/or
Local laws applicable to the activities it performs
under this bulletin, including but not limited to
handling, deploying, preparing, classifying,
packaging, marking, labeling, and shipping
dangerous goods. In the event of a conflict between
the procedures set forth in this bulletin and the
laws that apply to your dealership, you must follow
those applicable laws.
Parts Information
Causal
Part
Description
Part
Number
Qty
X
GEAR, FRT DIFF
CARR SUN
24290255
1
N/A
SEAL, A/TRNS
FLUID PUMP
24268389
1
N/A
GASKET, T/
CV HSG
24267848
1
Service Procedure
N/A
SHAFT, FRT WHL
DRV HALF
84990738
1
Refer to Front Differential Carrier Removal in the
Service Manual and Front Differential Carrier
Installation in the Service Manual.
N/A
WASHER, FRT
WHL DRV SHF
11611965
2
N/A
FLUID, A/TRANS
Refer
to EPC
As Required
Copyright 2023 General Motors LLC. All Rights Reserved.
Page 2
April, 2023
Bulletin No.: 23-NA-029
Warranty Information
For vehicles repaired under the Powertrain coverage,
use the following labor operation. Reference the
Applicable Warranties section of Investigate Vehicle
History (IVH) for coverage information.
Labor Operation
Description
Labor Time
8486258*
8.4 hr
Add
3.5 hr for LGX & AWD
Add
Add
Front Differential Carrier Sun Gear Replacement
.4 hr for LFY & FWD
5.6 hr for LFY & AWD
Add
2.3 hr for XT6 w/LGX & FWD
Add
5.2 hr for XT6 w/LGX & AWD
*This is a unique Labor Operation for Bulletin use only.
Version
1
Modified
Released April 11, 2023
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 equipment, tools, 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 GM dealer for information on whether your vehicle may benefit from the
information.
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