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Service bulletin 18NA311

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 id10155105
Published by NHTSA2019-03-25
Manufacturer's number18NA311
Manufacturer's date2018-11-01
NHTSA componentPOWER TRAIN:DRIVELINE:DIFFERENTIAL UNIT

NHTSA's summary

This technical bulletin provides a procedure to replace the rear diff assembly if the oil has leaked into the torque tube causing the rear diff to fail.

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, Differential

Vehicles listed
BUICK ENCLAVE2019
CADILLAC XT52019
CHEVROLET TRAVERSE2019
GMC ACADIA2019

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