# Service bulletin TSB\-32\-020\-WST

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 11030281
- Published by NHTSA: 2026\-03\-27
- Manufacturer's number: TSB\-32\-020\-WST
- Manufacturer's date: 2025\-10\-17
- NHTSA component: SUSPENSION

## NHTSA's summary

Technical Service Bulletin for TufTrac M12 Bolts

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11030281-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11030281-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Suspension

## Vehicles listed

- 2020 to 2021 WESTERN STAR 4700
- 2022 to 2026 WESTERN STAR 47X
- 2020 WESTERN STAR 4900
- 2021 to 2026 WESTERN STAR 49X
- 2020 to 2022 WESTERN STAR 5700
- 2023 to 2026 WESTERN STAR 57X
- 2020 to 2022 WESTERN STAR 6900

## Recalls for the same vehicles and component

- [20V660000](/recalls/nhtsa/20V660000.md), 2020-10-27: SUSPENSION:REAR:AXLE:SPINDLE
- [20V539000](/recalls/nhtsa/20V539000.md), 2020-09-03: SUSPENSION:MULTIPLE AXLE

## Other bulletins for the same vehicles and component

- [SS734\-WST](/bulletins/11000986.md), 2024-06-05, Other: SUSPENSION. Service Solution for Thread Spring Pin Suspension Alignment \& Installation
- [CALShackle](/bulletins/10185927.md), 2021-01-28, Service bulletin: EQUIPMENT ADAPTIVE/MOBILITY; SUSPENSION; EQUIPMENT; STEERING. Customer Advisory Letter for Threaded Pin and Bushing. Western Star Trucks built in 2020 with threaded pins and bushings have been found with loose shackles on the rear of the steering axle suspension. The pins are seizing from lack of lube causing the shackle to rotate on the pin.
- [TechTalk7742](/bulletins/10183399.md), 2020-12-04, Service bulletin: STEERING; SUSPENSION:FRONT:SPRINGS:LEAF SPRING ASSEMBLY:SHACKLE. Tech Talk discussion on loose rear spring shackle bushings in the springs causing steer axle to shift on pins. New comments added.
- [TechTalk7742](/bulletins/10181990.md), 2020-11-03, Service bulletin: EQUIPMENT; STEERING; SUSPENSION:REAR:SPRINGS:LEAF SPRING ASSEMBLY:SHACKLE. Tech Talk discussion on loose rear spring shackle bushings in the springs causing steer axle to shift on pins,
- [SS1034783REV](/bulletins/10181325.md), 2020-10-19, Service bulletin: SUSPENSION. Revised Service Solution for 20K Detroit Axle King Pin Lube Access. Western Star trucks equipped with 20k Detroit front axles and disc brakes built up to 8/17/2020 do not have sufficient room to access the king pin grease zerk.
- [SBW31\-016](/bulletins/10177605.md), 2020-07-31, Service bulletin: SUSPENSION:REAR; EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY. Western Star Bulletin for Non\-Airliner Rear Suspension Crossmember Fastener Change. With the start of production on March 2, 2020, the fasteners used to assemble the non\-Airliner rear suspension \(bogie\) crossmember have changed. The rear suspension bogie crossmember gussets to the C\-channel will be assembled with 5/8–18 fasteners. This change includes a revision to a higher friction nut that requires an increase in tightening torque. The new higher friction nut can be identified by its green color.
- [WP20\-001REV](/bulletins/10171359.md), 2020-02-15, Service bulletin: POWER TRAIN; LANE DEPARTURE; SUSPENSION; EQUIPMENT. Revision to a Warranty Policy Letter announcing the One Stop Supplier Extended Program Launch. The One Stop Supplier Extended Program streamlines the claim filing process because with One Stop Supplier Extended, the service network will file claims for some supplier\-supported coverages in OWL. Revisions are in blue.
- [SS1034621](/bulletins/10170323.md), 2020-01-21, Service bulletin: SUSPENSION. Service Solution for Western Star vehicles equipped with Hendrickson AIRTEK Axles experiencing a Harsh Ride.
- [WP20\-001](/bulletins/10170299.md), 2020-01-21, Service bulletin: UNKNOWN OR OTHER; POWER TRAIN; SUSPENSION; LANE DEPARTURE. Warranty Policy Letter announcing the One Stop Supplier Extended Program Launch. The One Stop Supplier Extended Program streamlines the claim filing process because with One Stop Supplier Extended, the service network will file claims for some supplier\-supported extended coverages in OWL.
- [CAL WST 32\-002](/bulletins/10168628.md), 2019-12-02, Service bulletin: EQUIPMENT; SUSPENSION; EQUIPMENT ADAPTIVE/MOBILITY. Customer Advisory Letter for Airliner welded axle seats. The welded axle seats were installed incorrectly on the rear most drive axle for specific vehicles resulting in an incorrect axle pinion angle. The existing welded axle seats will be removed and replaced with new axle seats installed in the correct orientation.

JSON: [/v1/bulletins/11030281](/v1/bulletins/11030281)

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