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Service bulletin 040101

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 id618159
Published by NHTSA2001-04-06
Manufacturer's number040101
Manufacturer's date2001-01-04
NHTSA componentPOWER TRAIN:DRIVELINE:DIFFERENTIAL UNIT

NHTSA's summary

SOME CUSTOMERS MAY COMPLAIN ABOUT DRIVELINE CLUNK WITH ACCELERATING AND / OR DECELERATING ON 1990 TO 2001 MEDIUM DUTY TRUCKS EQUIPPED WITH NO SPIN DIFFERENTIALS. *TT

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Transmission and driveline, Differential

Vehicles listed
CHEVROLET CHEVROLET TRUCK
GMC GMC TRUCK

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