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Service bulletin TT8144EN

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 id10136411
Published by NHTSA2018-05-14
Manufacturer's numberTT8144EN
Manufacturer's date2018-04-18
NHTSA componentEQUIPMENT; STRUCTURE

NHTSA's summary

Announces compatibility of aluminum main valve body in 3000 and 4000 series transmissions

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

Body and frame, Equipment and accessories

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.