24-NA-133 Service Bulletin/Repair Instructions

Bulletin No.: 24-NA-133
Service Bulletin
Date: May, 2025
INFORMATION

Subject:
Wheel Drive Shaft Retention Snap Ring Design Change
Brand:
Model:
Model Year:
Vehicle Build Date:
Engine:
Transmission:
from
to
from
to
HUMMER EV Pickup
2024
2025
April 17, 2024
EOP
All
S80 P8L P80

P79
HUMMER EV SUV
2024
2025
April 17, 2024
EOP
All
S80 P8L P80

P79
GMC
Involved Region or Country
North America
Information

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.

Important: This technical service bulletin (TSB) can only be completed by certified repair facilities who have met all

specific training, tool and equipment requirements pertaining to the vehicle Brand and Model serviced. Repairs must

be performed by a technician who has successfully completed the required training.

Note: For fluid leaks, reference Bulletin 25-NA-108.

The round ring and 3-Point rings are not interchangeable with either the wheel drive shaft and/or the drive unit. Do

Not mix snap rings between wheel drive shafts and drive units.

The above vehicles starting using a newly designed 3-point snap ring that retains the wheel drive shaft to the drive

unit output shaft.

The design change occurred to achieve greater retention forces between the wheel drive shaft and the drive unit

output stub shaft.

On vehicles equipped with ball-spline wheel drive shaft, the presence of a service groove (as shown below) on the

inboard housing means the drive unit is equipped with the 2nd design 3-Point snap ring.
Copyright 2025 General Motors. All Rights Reserved.
Page 2
May, 2025
Bulletin No.: 24-NA-133
6690539
6719216
Vehicles with a conventional CV joint style half shaft could also utilize the 2nd design 3-point snap ring. These shafts

do not require a service groove nor any special tools for removal or installation. It's important to remove the snap

ring and inspect the shape of the ring to determine if it's a 1st design round ring or a 2nd design 3-Point ring.

With the wheel drive shaft removed, the round style snap ring will fit loosely in the drive unit shaft groove. The 3point style snap ring will fit very tightly in the drive unit shaft groove.

When servicing the vehicle, if the wheel drive shaft is removed or replaced, care must be taken to determine which

snap ring is present. The round (silver) snap ring is considered the first design (Des 1), and the 3-point (black) oval

snap ring is considered the second design (Des 2). Refer to the Electronic Parts Catalog for Design 1 and Design 2

designations.

Important: The snap ring MUST ALWAYS BE REPLACED when removing or replacing the wheel drive shaft.

With the snap ring removed, lay the snap ring on a flat surface, and look at the shape of the snap ring.
Bulletin No.: 24-NA-133
May, 2025
Page 3
Round Ring First Design: PN 24048716
6690540
3 Point Oval Ring Second Design: PN 24052327
6690541
Additionally, shafts equipped with the service groove require the use of special tool CH-53441 - Half Shaft Slide

Hammer Installer Adapter and VJ-6125-1B Slide Hammer. Refer to Service Information for removal and installation

instructions.
Version
3
Modified
Released July 18, 2024

Revised August 15, 2024 – Updated Information, Added 2025 Model Year and GMC

Sierra EV.

Revised May 13, 2025 – Removed all vehicles except HUMMER EV Models and added

Note.
Page 4
May, 2025
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.
Bulletin No.: 24-NA-133
WE SUPPORT VOLUNTARY

TECHNICIAN

CERTIFICATION

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