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Service bulletin SIL 18-WT-17

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 id10117320
Published by NHTSA2017-09-14
Manufacturer's numberSIL 18-WT-17
Manufacturer's date2017-08-04
NHTSA componentPOWER TRAIN:AUTOMATIC TRANSMISSION; ENGINE

NHTSA's summary

Discusses two engine mounting adaption configurations for 4000 series transmissions with Navistar N13 engines.

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

Engine, Transmission and driveline, Automatic transmission

Vehicles listed
ALLISON 4000 SERIES TRANSMISSION

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