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Service bulletin 667406

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 id50569
Published by NHTSA1997-05-27
Manufacturer's number667406
Manufacturer's date1996-12-01
NHTSA componentPOWER TRAIN:MANUAL TRANSMISSION

NHTSA's summary

TRANSFER CASE HOPS OUT OF 4-HIGH, OR NO DRIVE IN 2 OR 4-HIGH RANGES AND/OR GRINDING NOISE (INSTALL MAINSHAFT/RANGE HUB KIT) *TW

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, Manual transmission

Vehicles listed
CHEVROLET C SERIES (LIGHT)1990 to 1996
GMC K SERIES1989 to 1996
GMC YUKON1989 to 1991
GMC YUKON1992, 1993, 1994, 1995, 1996

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

Other bulletins for the same vehicles and component
667202A1997-06-27. Service bulletin. MANUAL TRANSMISSION RATTLE NOISE AT IDLE (INSTALL CONVENTIONAL FLYWHEEL). *TW