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Service bulletin SIL 15-WT-15 Rev

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 id10117304
Published by NHTSA2017-09-14
Manufacturer's numberSIL 15-WT-15 Rev
Manufacturer's date2017-01-12
NHTSA componentEQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL

NHTSA's summary

Announces new series of bus models and details parts used for conversion to new series.

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, Labels and manuals

Vehicles listed
ALLISON TRANSMISSION, INC B3400
ALLISON TRANSMISSION, INC T3280
ALLISON TRANSMISSION, INC T3325
ALLISON TRANSMISSION, INC T3375

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