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Service bulletin SIL 04 WT 17EN R

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 id10200349
Published by NHTSA2021-08-16
Manufacturer's numberSIL 04 WT 17EN R
Manufacturer's date2021-06-04
NHTSA componentPOWER TRAIN

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

Transmission and driveline

Vehicles listed
ALLISON TRANSMISSION

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