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Service bulletin SIL 4-WT-17EN

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 id10117307
Published by NHTSA2017-09-14
Manufacturer's numberSIL 4-WT-17EN
Manufacturer's date2017-02-15
NHTSA componentPOWER TRAIN; EQUIPMENT:MECHANICAL

NHTSA's summary

Announces new transmission breather using an outer hex design and details for servicing the new design.

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

Equipment and accessories, Transmission and driveline

Vehicles listed
ALLISON 3000 SERIES TRANSMISSION
ALLISON 4000 SERIES TRANSMISSION
ALLISON TRANSMISSION

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