22-NA-223

Bulletin No.:
Service Bulletin
Date:
22-NA-223
November, 2022
INFORMATION
Subject:
Brand:
Chevrolet
Information on Clicking and/or Chattering Noise Coming From the Rear of the Vehicle
While Making Tight Turns
Model:
Model Year:
VIN:
from
to
Engine:
from
to
3500/4500
Medium Duty (LCF)
2016
2020
L96
3500/4500
Medium Duty (LCF)
2020
2023
4HK1
4500HD/4500XD
Medium Duty (LCF)
2017
2023
4HK1
5500HD/5500XD
Medium Duty (LCF)
2017
2023
4HK1
6500XD
Medium Duty (LCF)
2019
2020
4HK1
Transmission:
Involved Region or Country
North America
Additional Options (RPOs)
G86: AXLE-LIMITED SLIP
Condition
Some customers with N-series vehicles may comment that an audible clicking or
chattering noise coming from the rear of the vehicle while making tight turns.
Cause
Copyright 2022 General Motors LLC. All Rights Reserved.
This condition may be caused by incorrect axle fluid having been used during the last
scheduled maintenance or in a previous repair.
– The condition can also result from delayed or skipped maintenance resulting in
degradation of axle fluid.
Page 2
November, 2022
Information
Bulletin No.: 22-NA-223
6182582
Refer to the graphic above to identify a limited slip differential or check the vehicle build in
IVH (Investigate vehicle History) for Option Code G86.
– LSD Stamp Codes
• B7
• D0
• D8
• D9
• H0
• H9
To resolve this problem, take the following steps/actions.
1. Replace the differential gear oil with a commercially-available gear oil (SAE80W-90
GL-5, SAE90 GL-5) and add 20oz of limited slip differential lubricant additive (P/N
88900330 (quantity of five (5), 4oz bottles). Refer to Fluid and Lubricant
Recommendations in SI.
2. Road test the vehicle for at least 10 miles by making eight to ten tight left and right
turns, such as going around a corner, to ensure the limited slip is activated and to
determine if there is no longer any audible clicking or chattering noise coming from
the rear of the vehicle during tight turns.
3. If the condition persists, technicians are to call the Technical Assistance
Center (TAC)
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.
Version
1
Modified
Released November 02, 2022
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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