NHTSA ID Number: 11014021
Manufacturer Communication Number: 20-NA-175
TSB/Document Date: 2025-02-08
Summary
This technical bulletin provides repair information to correct a customer concern of vertical misalignment between cab and pickup box on driver side of vehicle.
Bulletin No.: 20-NA-175
Service Bulletin
Date: January, 2025
TECHNICAL
Subject:
Vertical Misalignment Between Cab and Pickup Box on Driver Side of Vehicle
Brand:
Model:
Model Year:
from
to
2019
2019
2020
2021
2022
2022
Silverado 1500
2023
2025
Silverado 2500HD/
3500HD
2020
2020
Sierra 1500 (New
Model)
2019
2019
Sierra 1500
2020
2021
Sierra 1500 (LIMITED RPO J21,
12th VIN Digit = 4 or
less)
2022
2022
Sierra 1500
2023
2025
Sierra 2500HD/
3500HD
2020
2020
Silverado 1500 (New
Model - 12th VIN Digit
= 7) - 4WD
VIN:
from
Engine:
All
All
to
Silverado 1500 (New
Model)
Silverado 1500
Chevrolet
Silverado 1500 (LTD, RPO J21, 12th
VIN Digit = 4 or less)
Silverado 1500 (RPO J22, 12th VIN
Digit = 5 or greater)
Sierra 1500 - (RPO
J22, 12th VIN Digit =
5 or greater)
Involved Region or Country
North America, Middle East, Israel, Palestine, Chile, Paraguay, and Thailand.
Additional Options
Crew Cab and Extended Cab Models ONLY
Copyright 2025 General Motors. All Rights Reserved.
Page 2
January, 2025
Bulletin No.: 20-NA-175
Condition
5645798
Some customers may comment on noticing anywhere from 2 –10 mm (0.08 – 0.4 in.)
vertical misalignment of the body feature line between the cab and the pickup box, on the
driver's side of vehicle.
Cause
The cause of the condition may be pickup box structure variation.
Correction
Realign the left side of the cab and install shim washers, following the steps in the
Service Procedure below.
Service Procedure
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.
5645804
1. Verify the condition by visually checking, and measuring, the body feature line variance, on the left side of the
vehicle.
Bulletin No.: 20-NA-175
January, 2025
Page 3
2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in SI.
5645799
5645800
3. Remove the 3 left side body mount bolts and washers (1).
Page 4
January, 2025
Bulletin No.: 20-NA-175
5645802
Note: For trucks with running boards, the jack can be positioned below the running board bracket. For trucks without
running boards, position the jack below the cab pinch weld and use a wood block to protect the paint, and sheet
metal.
4. Using a jack stand (1), raise the cab high enough to achieve enough clearance to install the shim washers
between the body of the truck and the top of each body mount.
5. Install shim washers to each body mount location(s) as needed.
Note: Typically, it will take 2 shim washers in the rear mount to get a 10 mm adjustment in height at the body line. If
more than one washer shim is installed on the rear body mount, you will need to put a single shim washer on the
mount at the B-Pillar.
Important: We should never install more than 2 shim washers in the rear to make the alignment, one will get roughly
5 mm at the box/cab and two will get roughly 10 mm at box/cab interface.
6. Remove the jack stand from the cab.
5645799
7. Perform the following procedure before installing the body mount bolts (1).
7.1.
Remove all traces of any of the original adhesive patch from the bolt threads.
7.2.
Clean the threads of the bolts with denatured alcohol, or equivalent, and allow to dry.
Bulletin No.: 20-NA-175
7.3.
January, 2025
Page 5
Apply Threadlocker to the body mount bolts.
5645806
8. Re-torque the 3 left side body mount bolts.
Tighten.
Tighten the bolts to 165 Nm (122 lb. ft).
9. Remove the support and lower the vehicle.
10. Verify that the cab alignment condition has been eliminated.
Parts Information
Causal
Part
N/A
Description
Part
Number
Shim
84642724
Threadlocker
12345382
(U.S.)
10953489
(Canada)
Qty
As needed
Warranty Information
For vehicles repaired under the Bumper-to-Bumper coverage (Canada Base Warranty coverage), use the following
labor operation. Reference the Applicable Warranties section of Investigate Vehicle History (IVH) for coverage information. Submit the cost of the required washers as “Net Item Miscellaneous”.
Labor Operation
Description
Labor Time
1481418*
Realign Left Side of Cab to Pickup Box, Install Shim Washers
0.6 hr.
*This is a unique Labor Operation for Bulletin use only.
Page 6
January, 2025
Bulletin No.: 20-NA-175
Version
6
Modified
Released - September 02, 2020
Revised October 27, 2020 – Removed Date Breakpoint
Revised December 21, 2020 – Added 2021 Model Year to Silverado/Sierra 1500.
Revised May 09, 2022 — Updated Shim Part number and Added 2022 Model Year.
Revised July 27, 2023 — Added 2023 and 2024 Model Years.
Revised January 31, 2025 – Added 2025 Model Year.
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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TSB/Document ID: 20-NA-175
Replacement Service Bulletin Number:
MFR Communication Date: 2025-02-01
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: STRUCTURE:BODY
MFR Component System:
MFR Component Subsystem:
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