2021 International LT TSBs
196 Technical Service Bulletins across 15 categories
Categories
Engine
74 bulletinsThis document will guide the user through the changes of the dielectric grease/coatings used in certain areas on all...
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International vehicles built after 1/8/2018. International's Electrical Engineering Team made this change to improve the longevity of the OEM coatings and to improve applications at the factory.
This document provides guidance for assessing the feasibility of implementing a customer-requested change to an engine or vehicle parameter/feature.
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Customer requested changes will be approved in accordance with the requirements specified in 40 CFR Part 1037 to ensure continued compliance with greenhouse gas (GHG) regulations.
This document enables technicians to: 1.
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Accurately identify International A26B engine control systems. 2. Understand the programming requirements and system behavior. 3. Perform programming tasks independently without needing technical support.
This document enables technicians to: 1.
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Accurately identify International A26A engine control systems. 2. Understand the programming intricacies related to these systems. 3. Perform programming tasks independently without needing technical support.
This document provides guidance for assessing the feasibility of implementing a customer-requested change to an engine or vehicle parameter/feature.
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Customer requested changes will be approved in accordance with the requirements specified in 40 CFR Part 1037 to ensure continued compliance with greenhouse gas (GHG) regulations.
New CARB Idle Reduction Change Request
Engine replacements for all International engines will need to follow this procedure.
Feature code 0008TSJ for auto start stop is a feature that will allow you to preset values in the body controller to...
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allow the truck to start when the battery voltage or engine oil temperature reaches the preset value. The engine will then run for a preset time after battery voltage is within programmed value (if the engine started for low voltage) or the engine will run until oil temperature reaches a programmed value (if the engine started for oil temperature).
In some geographic areas, ambient temperatures reaching below 40F (4C), including high levels of humidity, an operator...
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may experience engine stalling, low performance, and/or poor aftertreatment performance. This is caused by condensation accumulating and freezing within the Charge Air Cooler (CAC); affecting air flow into the engine. This article lists currently available winter front covers that can be installed on the front grille and bumper to reduce cold air flow to the engine compartment.
This document will guide the user through diagnosing an intermittent shutdown complaint on a 2021 A26 (A26B), whether...
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the vehicle is coming to a stop or sitting at idle.
This document guides dealer technicians through the programming process for an A26a (2017-2021) engine swap (both NEU...
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and new engines).
In some geographic areas, ambient temperatures reaching below 15F (-10 C), including high levels of humidity, an...
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operator may experience engine stalling, low performance, and or poor aftertreatment performance. This is caused by condensation accumulating and freezing within the Charge Air Cooler (CAC); affecting air flow into the engine. This article lists all the currently available winter front covers that can be installed on the front grille and bumper to reduce cold air flow to the engine compartment.
Title: Engine Emission Label Replacement, Certificate of Conformance and Clean Idle Sticker Addition Procedure Applies...
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To: All Navistar Powered Trucks Requesting Engine Emission Label Replacement, Certificate of Conformance and/or Clean Idle Sticker, Clean Truck Check
Title: Replacing the Crankshaft Gear on S13 Engines
Title: Supplemental A26 MAF Fault Diagnostics Applies To: All A26 Engines
Title: How to Request a Horsepower Quote Applies To: All International and Cummins Electronic engines
Applies To: All Navistar Powered Trucks Requesting Engine Emission Label Replacement, Certificate of Conformance and/or...
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Clean Idle Sticker, Clean Truck Check
This document will guide the user through relocating the No-Idle system's voltage sense source from the battery to the...
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interior sleeper PDM.
The purpose of this document is to guide a user to resolve fault code 285 & 286 for Cummins engines.
This document will guide the user through various field repairs to eliminate the squeaks, rattles knocking of the engine...
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hood on International LTs and RHs
This document will guide the user on what to do when they receive a fault code after programming an ECM on A 26A engines
Certain International vehicles built with A26 engines does meet the emission requirements for J1939-Stationary Test
Starter Diagnostics and warranty claim procedure; all engines EXCLUDING Cummins ISB engine with Allison transmission or...
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PSI engine.
Rebuilding Cylinder Heads on Certain MaxxForce 11/13, N13, and A26 engines; 2010 to present.
A26 and S13 Fuel Gelling; only vehicles equipped with International A26 or S13 engines
No Idle HVAC run time shorter than expected - Bregstrom; Only Sleeper cab models with feature code 16UZL or 16VLN.
How to request a horsepower quote; all International and Cummins engines
Snap-On torque wrench requirement for all big bore engine connecting rod bolts; A26, MaxxForce 13, N13 engines
Removal and Installation of the Air Cleaner Assembly Cover and Air Filters; All Engines and only HX and LT series trucks...
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with feature code 012VCB or 012VBZ Air Cleaner Assembly
This Emissions Recall applies to truck models for which, per agreement with EPA and CARB, Navistar, Inc.
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provided an emergency calibration for International A26 engines when a DEF Quality Sensor (DQS) was not available. This action addressed the Diesel Exhaust Fluid (DEF) Quality Sensor failures in the field and the unavailability of parts due to the worldwide chip shortage. This recall is step two of this program designed to revert all affected vehicles back to the certified calibration and to provide them with the latest improved DQS and Coolant Control Valve (CCV) designs. Additionally, the emergency calibration and the restoration to the certified calibration with the latest improved DQS and Coolant Control Valve (CCV) designs have no effect on vehicle Emissions.
New air compressor incorporates an oil feed dowel O-ring.
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Only models equipped with 2010 and newer MaxxForce 11/13 engines, all N13, and A26 engines
Per agreement with EPA and CARB, Cummins, Inc.
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provided an emergency calibration for Cummins ISB, B6.7, ISL9, L9, and X15 engines when a DEF Quality Sensor (DQS) was not available. This action addressed the Diesel Exhaust Fluid (DEF) Quality Sensor failures in the field and the unavailability of parts due to the worldwide chip shortage. This recall is step two of this program designed to revert all affected vehicles back to the certified calibration and to provide them with the latest improved DQS and Coolant Control Valve (CCV) designs. Additionally, the emergency calibration and the restoration to the certified calibration with the latest improved DQS and Coolant Control Valve (CCV) designs have no effect on vehicle Emissions.
New Air compressor Incorporates an oil feed dowel O-ring; only models built with MaxxForce 11/13, N13, or A26 Engines
Rebuilding cylinder heads on certain EPA 2010 MaxxForce 11/13, N13, and A26 Engines
Cummins Programming guide and fault codes285 & 265; only vehicles built with Cummins B6.7, X15, or L9 engines
Starter diagnostics and warranty claim procedure for all engines and all chassis EXCLUDING vehicles equipped with PSI...
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engines or Cummins ISB engine with Allison transmissions
Certain HV, HX, LT, and RH Series trucks may have incorrect idle shutdown programmable parameters.
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Updating the programmable parameters will address this concern.
Installation of the 7104674C92 Engine Sensor Harness on 2021 and Newer International A26B engines.
Rebuilding Cylinder Heads on Certain International MaxxForce 11/13 engines and all International N13 and A26 engines
Service Diagnostic Software (SDS) Template to enable Recall 22518 connecting rod knock detection software.
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Only vehicles with International A26 Engine
QLS Emergency ECM Calibration; only models equipped with Cummins B6.7, X15, L9, or International A26 engines
QLS Emergency Calibration.
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applies to 2016 and newer Cummins B6.6, X15, and L9 engines and all A26 engines
These certain trucks may have incorrect ECM programming in make and model programmable parameter.
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Only models built with 2021 model year A26 engines.
During high electrical demand, the cables that ground the batteries to the vehicle frame can carry the full system...
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current and may result in excessively hot battery ground cables and in some cases, battery post separation. Only trucks equipped with Cummins engines, feature codes 0008GXK, 0008GHJ and 0008GWY (high output alternators 275 to 375 amp output), and feature codes 0016UZL and 0016VLN (no idle HVAC), or 008XDM and 008XLD (DC to AC power inverter).
The Body Control Module (BCM) may have outdated software that could result in active Over The Air (OTA) programming to...
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not fully complete and result in an inoperative Engine Control Module (ECM). Only models with International A26 engine and feature code 10ADT, 10AEK, 10AEU, 10AEY, 10AEZ, 10AGB, or 10AGC (Telematics Communications Module).
Under certain conditions, the Engine Control Module (ECM) programming may not detect when the Exhaust Gas Recirculation...
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(EGR) flow exceeds the predetermined threshold resulting in not setting a fault code and activating the Malfunction Indicator Light (MIL). Only models equipped with International A26 engine.
International A26 engine fuel delivery pressure sensor and harness pigtail eliminated
Installing P/N 7104373C91 A26 Engine Sensor Harness
LINK ride height smart valve operation and troubleshooting guide
2021 A26 low power in cold climates.
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Only vehicles equipped with A26 engine
High Pressure Fuel Pump external leaks from weep hole.
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only trucks with 2010 MaxxForce 11/13L, all N13, or A26 engines
QLS Emergency Calibration; Models equipped with 2016 and newer Cummins B6.7, X15 and L9 engines or International A26...
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engine.
QLS Emergency Calibration; Models with 2016 Cummins ISX, A26 and EPA 2017 and newer Cummins X15, L9, or B6.7 engines
The Environmental Protection Agency (EPA) and California Air Resources Board (CARB) have approved an emergency...
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calibration to provide temporary relief from the global supply shortage of electrical components. When there is a communication fault in the DEF head unit / Quality Level Sensor (QLS) this temporary calibration will allow the vehicle to operate. The procedure in this document will include diagnosing the DEF head unit / QLS and if found to be defective will advise to install the temporary engine calibration if replacement parts are not available. Any vehicle that receives this calibration will be required to have it removed and a new QLS installed once parts become available, this will be managed through future communication.
Oil leaks at the Bottom of the Oil Filter Module; Only International A26, N13, or 2010 and newer 11 and 13 engines
Engine Oil Capacities.
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All International electronic engines 1994 to present and Cummins ISB, ISM, or ISX engines
QLS Emergency Calibration.
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Only models with EPA 2017 and newer Cummins X15, L9, or B6.7 engines
Snap-On torque wrench requirement for all big bore engine connecting rod bolt(s).
Altec Industries, Inc.
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has received notification from Navistar that a condition exists relating to motor vehicle safety, compliance, or emissions in a vehicle equipped with Altec equipment. Navistar has decided that a non-compliance that relates to motor vehicle safety exists in certain 2021 HV, LT, MV, and RH series trucks built from July 28, 2020, through October 2, 2020, with a Bendix air brake system. Contact your International dealer, a Love's Truck Tire Care, or a Speedco location to schedule a service date to perform the recall. Love's and Speedco locations in Texas are not able to perform warranty services. Altec is not able to complete this repair. This repair is not covered under the Altec Warranty policy.
A26 Fuel Delivery Pressure Sensor (FDP) and Harness Pigtail Eliminated; only trucks equipped with International A26...
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engine
CPA BEAM RCT and Idle Test for A26 engine; only trucks equipped with International A26 engine
The connecting rod bushing over time may develop cracks or lose chunks of material that could lead to connecting rod...
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engine failure.
Certain HV, LT, MV, and RH series trucks do not conform to Federal Motor Vehicle Safety Standard (FMVSS) 121 relating to...
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the secondary air brake system.
The battery ground cable may break at the frame connection resulting in loss of electrical power and unintended engine...
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shut down without warning.
The battery ground cable may break at the frame connection resulting in loss of electrical power and unintended engine shut down without warning.
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Unintended engine shut down without warning may result in a vehicle being stalled on the side of the roadway which could increase the risk of a vehicle crash.
A26, N13, and 2010 EPA MaxxForce 11 and 13 engine Auxiliary Programable Parameters
This document will guide the user through what is normal appearance for a NEU A26 replacement engine assembly.
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Only models built with International A26 engines.
1 channel CPA RCT test for A26 or CV 6.6L; Only trucks built with International A26 or 6.6 engines
7095496C3 EGR Bellows Heat Shield ID; only models equipped with A26 Engine
Fuel Filters, Winter Additives, and Blending Fuels for Cummins Engines
Foot Valve Air Leak- Bendix ATR6 Traction Control Relay Valve Diagnostics; Only Models with Cummins X15 engine and...
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feature code 04ECC air dryer
This document will guide the user through the proper use of the A26 Misfire Detection Session to determine cylinder...
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misfire count releted to the specific misfire DTCs.
DEF Coolant Line Leak Rear of Engine; only models with International A26 engine
Eaton AMT Calibration Update with 2020 Cummins X15 Engines; only trucks built 02 January 2020 through 02 April 2020.
Other
37 bulletinsThis document will guide the user through parts information and installation instructions for the IMP Isolation Kit.
Some interaxle shafts (the driveshaft connecting 2 drive axles) utilize special phasing.
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This is by design to reduce torsional vibrations. See Dana/Spicer letter here & Meritor here.
This document will guide the user through troubleshooting steps to submitting a case file for a horsepower request.
This document will guide the user through understanding Prop Shaft Codes and understanding the variations of prop codes.
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(Metric Prop codes start with the number a 4 and Non metric Prop codes start with a 2.)
Title: Driveline Information Center and Troubleshooting Procedures Applies To: All Vehicles
Title: Fan belt replacement guidelines for frayed edges Applies To: All Models
Title: 2021 A26 (A26B) - Intermittent Shutdown
Title: Parameters for 16UZL with 16VKW Applies To: Vehicles with both feature codes 16UZL and 16VKW
Switch Pack Programming Troubleshooting Information
Title: Connecting an Auxiliary APU to the S13 Coolant System
Title: Supplemental A26 MAF Fault Diagnostics
This article will call out those VINs that are equipped with the shim, and if and when the shim should be used as a...
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field repair solution.
This document is used to help guide through fault codes.
This document will guide the user how to addresses chassis lean conditions on all chassis.
This document will provide the user with cleaning options and procedures for aluminum bright work parts that become...
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stained or tarnished.
J1939 Data Link Source Address Information
Diagnosis of chassis wander complaints.
J1939 Data Link Source Address Information
J1939 Data Link Troubleshooting
Auto Start Stop Information and troubleshooting; Only LT with feature code 08TSJ
Telematics installation guidelines - Only units with 500K data link
J1939 Data link source address information
Pico Scope CCOS (Crankcase Separator Test)
LT A26 Cold Side CAC Hose Rupture
PicoScope Test One Channel RCT
PicoScope Test Resistance and Ohmmeter
PicoScope Test for Datalink (CAN) Health Shorts & opens
Side mounted cab extender fins that provide more flexibility during trailer contact.
J1939 Data Link Source Address Information
Greenhouse Gas Phase 2 Regulatory Compliance Implementation
J1939 Data Link Troubleshooting
How to obtain As built parameter list
SiriusXM Reception Issues with Film Antenna in Hi-Rise Sleeper
Navistar N2 Telematics with Predictive Cruse Control; Only LT Series built after July 9th, 2020 with feature 12XBE
Cab Lean Concern
Driveline Information Center and Troubleshooting Procedures
Dielectric Grease Change
Electrical
23 bulletinsCertain International trucks and IC BusTM CE Series buses may have out of date BCM programing that may cause erroneous...
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fault codes after a vehicle sits for 2 or 3 days.
Certain International trucks and IC BusTM CE Series buses may have out of date BCM programing that may cause erroneous...
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fault codes after a vehicle sits for 2 or 3 days.
This document provides: Steps to take when switch pack programming fails, or when switch pack disappears after body...
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control module update Sample scenarios Additional information to assist readers in understanding DLB switch pack programming
Title: Battery Disconnect Switch Replacement - Best Practices Applies To: All Models with Battery Disconnect Switch
This document details the procedure that must be followed to ensure proper alternator troubleshooting.
This document covers battery diagnostics, maintenance and storage requirement.
LT & RH aftertreatment PDM F2 fuse falling out or cracking.
Aftertreatment PDM F2 fuse falling out or cracking.
Corroded TPMS Receiver / Repeater Module Connectors; only models equipped with feature code 16VLS or 16VVM
Certain LT and RH series trucks with Lane Keep Assist (LKA) may have outdated software in the LKA Electronic Control...
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Unit (ECU), resulting in false positive fault codes. A software update will resolve this issue.
General Wheel Speed Sensor Troubleshooting
Fifth Wheel Unlock - Trailer Lamp Detection Calibration.
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Only models equipped with BCM feature code 597017
N2 telematics module not communicating with OCC systems.
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Only models built with feature codes 10ADT, 10AEY, 10AEU, 10AEZ, 10AGB, or 10AGC built from 04/04/2019 through 11/01/2022.
LT Truck headlight harness inspection and repair; only units built prior to 04/11/2022
PicoScope Wheel Speed Sensor Test
PicoScope Test - Battery Loss of Charge - Parasitic Draw Test
PicoScope Test 5V & 12V Intermittent Open and Short circuit diagnostics
The positive battery cable to the inverter may chafe on the side skirts and over time could result in an electrical...
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short to ground; only trucks built 02/10/2017 thru 02/25/2022 with a power inverter installed by Navistars Truck Specialty Center
New or replacement body control Module (BC,BCM) not detected; Gen 4 BCM
The ESPAR heater may not function properly because of a constant voltage supply from the BCM to the ESPAR control module.
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2020 Model year HX, LT and Lonestar
General wheel speed sensor troubleshooting
The telematics module may not call home, resulting in an inability to perform over-the-air programming.
Ambient Air Temperature (AAT) Sensor Faults/Location/Diagnostics
Body & Paint
17 bulletinsIn some instances, the driver's or passenger's door pod may become unresponsive, where it will not respond to any manual...
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inputs from the driver or passenger. In some of these situations, it is possible for this symptom to be present without any fault codes becoming active. This article will guide the user through performing a hard reset of a door pod, which can restore the door pod to its operational condition, thereby avoiding the need for replacement. The steps in this article should be performed BEFORE diagnostics are completed for any active faults.
This article addresses chassis lean conditions on all chassis.
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This does not include any diagnostics for body leans such as a cab lean. Keep in mind that a chassis lean may cause or accentuate a cab lean. Filling out the printable form and using the notes in blue will help you to determine the source of the lean and identify the action and parts required to correct the lean.
Hood guide installation
Cab water leak trouble shooting tips
Primer recommendation for matching textured panels to smooth panels for field repairs
Textured surfaces on painted plastic bumpers, chassis side skirts, and fender extendtions
Water leaks past plastic vapor barrier sheet in the inner cavity of the cab entry door
Cab water leak troubleshooting tips; HX with steel cab only
Cab water leak troubleshooting tips
Aftertreatment Clamp Corrosion; Single Can Aftertreatment Systems
Day cab roof air deflector causing loud vibration noise at highway speed
Sleeper bunk cabinet door latch installation and adjustment
Programming Procedure for Center Panel Switch Packs
Programming Procedure for Center Panel Switch Packs
The mirror glass of the hood mirrors may have been assembled incorrectly and could cause it to loosen from the housing.
Programming Procedure for Center Panel Switch Packs
Programming procedures for the center panel switch packs has changed.
Fuel System
9 bulletinsThis document will guide the user through the parts and information related to A26B resonator removal and EGR cross-over...
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tube installation.
This document will guide the user through the parts and information related to A26B resonator removal and EGR cross-over...
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tube installation.
This document will guide the user through supplemental fuel system diagnostics on 2017 A26 ESN 4500000 - 4599999.
This document will guide the user through the parts and information related to A26B resonator removal and EGR cross-over...
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tube installation.
This document will guide the user through diagnosing the fuel/soot mixture found in the EGR system.
Some interaxle shafts (the driveshaft connecting 2 drive axles) utilise special phasing.
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This is by design to reduce torsional vibrations. See Dana/Spicer letter here & Meritor here. Dana DS404 rear axle housing families use offset interaxle driveshaft phasing to reduce torsional vibrations. Depending on the interaxle driveshaft series, the phasing will be different. Vehicles built with 0417LTFXXXX drivelines until 03/23/2009 use 32 degree phasing, while vehicles built with 0417LTGXXXX drivelines from 3/12/2009 to current use 48 degree phasing. There is an overlap of 11 days where either shaft could have been used.
This document will guide the user through the parts and information related to A26B resonator and EGR cross-over tube...
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installation.
Title: Export Recalibration Process & Emissions Label - A26 Applies To: Service Manager, General Manager, Technicians.
A26 & S13 Fuel Gelling
Transmission
8 bulletinsThis document is to notify the field of an issue with BCM that causes various electrical system concerns after the vehicle sits for 2-3 days.
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This can affect all LT, RH, MV, HV models, 2021MY and up HX, 2024MY and up CE Bus with BCM kernel version 752, 753, and 754. Vehicles built or updated with DLB between 6/1/25 and 11/4/25 are suspected of having these kernels installed on the BCM. The most common complaint is that the steering wheel switches do not function, which, depending on the vehicle model and options, can cause the bus door, pupil warning lights, radio controls, marker interrupt, and cruise control to stop working. Other complaints can include short circuit faults from multiple sensor circuits attached to the BCM setting at the same time, the vehicle will not go into gear, the headlights are stuck on, the brake lights are stuck on, or the parking brake alarm is sounding (horn chirping) with the parking brake set. As of 11/4/25, these symptoms can be resolved by updating the BCM to kernel 755 or later with DLB.
Title: S13 Gear Housing Leak (By The Air Compressor) Applies To: S13 Integrated Powertrain LT RH HX
Title: Steering Gear Seal Repair Guidelines Applies To: Steering gears
This document will guide the user how to properly diagnose or repair a truck equipped with a Sheppard's steering gear...
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with Auto Relief Plungers.
Endurant Plumbing Retrofit; only models built with endurant transmission built before 11/01/2023
Power Steering Diagnostics Flow / Pressure Specifications For Power Steering Gears and Power Steering Pumps
The spring inside the spring brake chamber may allow the pressure plate to shift and wear a hole through the diaphragm...
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resulting in an air leak.
Certain vehicles with a manual transmission may need the BCM to be updated for the over-the-air (OTA) programming to...
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function.
HVAC & Climate
6 bulletinsTitle: A/C Refrigerant and Oil Capacities Applies To: All current models
This document will guide the user on the available part kits for servicing A/C system in the event of severe failure.
Potential A/C Compressor Parts shortage - 4158126C1 (A/C compressor)
Potential A/C Compressor Parts Shortage
2021 A26 Low Power In Cold Climates
A/C Refrigerant and Oil Capacities
Tires & Wheels
5 bulletinsTire Pressure Monitoring system; Feature Codes 16VLS, 16VUY, 16VVA, 16VVM, or 16VUZ
Tire Pressure Monitoring systems (TPMS); Only LT, RH, HV, HX, or MV series trucks with feature code 16VLS, 16VUY,...
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16VVA,16VUZ, or 16VVM
Cab Components That Reduce Wheel End Vibration Complaints
Cab Components That Reduce Wheel End Vibration Complaints.
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NOTE: Lonestar Day Cab Only
Feature 16VLS Tire Pressure Maintenance System (TPMS)
Infotainment
3 bulletinsThis tool is designed to compare Diamond Logic feature data across multiple vehicle configuration files.
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It allows users to quickly load files either manually or directly from the Diamond Logic Builder Vehicles folder using VIN-based selection. As files are added or removed, the comparison runs automatically with no manual action required. The program presents results in an interactive table that shows feature codes, descriptions, access levels, and whether each feature is present in each selected file. Built-in search, filtering, and sorting make it easy to locate specific features or focus only on differences between files. Column visibility can be customized to show or hide descriptions and access information as needed. Users can remove files individually or clear all files at once, with results updating instantly. The tool also includes reporting and export options that reflect exactly what is visible on screen, allowing results to be printed, copied, saved as text, or exported to CSV for use in Excel or other spreadsheet tools. Overall, the program streamlines the process of comparing vehicle feature configurations, helping users quickly identify differences, validate setups, and document results without manual comparison or external tools.
Radio clock changes time automatically; Only vehicles built after March 2020 and excluding CV
Bluetooth Cannot Be Connected to Radio
Brakes
3 bulletinsThis document will guide the user through a step-by-step procedure for detecting water leaks in vehicle cabs and...
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windshields using an ultrasonic sound detector.
This document is to guide users to eliminate brake pedal rattle noise.
Certain LT Series trucks built with feature codes 004XCL and 004XCN (L2.0 ADB Air disc Brakes), over time the caliper...
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self adjusting wrap spring may experience reduction of tension resulting in reduced caliper self-adjuster performance.
Software & Calibration
3 bulletinsUpdate to International Preventative Maintenance
QLS Emergency Calibration Revert Process
QLS Emergency Calibration Revert Process
Lighting
3 bulletinsThe Proposition 65 and/or DEF warning light labels may not have been installed at time of vehicle manufacture.
Lane Departure Warning Alert Active with Turn Signals On; Only models equipped with Lane Departure Warning
Repair Procedures for Vehicles Struck by Lightning
Pre-Delivery & Maintenance
2 bulletinsTitle: Service Portal iKNow Feedback Case Types Applies To: All
Frame Rail Straightness Inspection Procedure
Steering
2 bulletinsTitle: S13 New Power Steering Tube Support Brackets
Steering Shake, Shimmy, Shudder, Wobble, Steering Vibration; only models built with 14K weight rated axles or lower
Suspension
1 bulletinThis document reminds technicians of the critical relationship between the truck's suspension and the driveline operating angles.
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The information applies to diesel, gas, and electric vehicles.