WenmarOpen by Wenmar Pro

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id11030281
Published by NHTSA2026-03-27
Manufacturer's numberTSB-32-020-WST
Manufacturer's date2025-10-17
NHTSA componentSUSPENSION

NHTSA's summary

Technical Service Bulletin for TufTrac M12 Bolts

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Suspension

Vehicles listed
WESTERN STAR 47002020, 2021
WESTERN STAR 47X2022 to 2026
WESTERN STAR 49002020
WESTERN STAR 49X2021 to 2026
WESTERN STAR 57002020, 2021, 2022
WESTERN STAR 57X2023 to 2026
WESTERN STAR 69002020, 2021, 2022

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
20V6600002020-10-27. SUSPENSION:REAR:AXLE:SPINDLE
20V5390002020-09-03. SUSPENSION:MULTIPLE AXLE

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
SS734-WST2024-06-05. Other. Service Solution for Thread Spring Pin Suspension Alignment & Installation
CALShackle2021-01-28. Service bulletin. 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.
TechTalk77422020-12-04. Service bulletin. Tech Talk discussion on loose rear spring shackle bushings in the springs causing steer axle to shift on pins. New comments added.
TechTalk77422020-11-03. Service bulletin. Tech Talk discussion on loose rear spring shackle bushings in the springs causing steer axle to shift on pins,
SS1034783REV2020-10-19. Service bulletin. 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.
SBW31-0162020-07-31. Service bulletin. 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.
WP20-001REV2020-02-15. Service bulletin. 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.
SS10346212020-01-21. Service bulletin. Service Solution for Western Star vehicles equipped with Hendrickson AIRTEK Axles experiencing a Harsh Ride.
WP20-0012020-01-21. Service bulletin. 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 32-0022019-12-02. Service bulletin. 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.