{"nhtsa_id":603827,"type":"service_bulletin","type_name":"Service bulletin","date_added":"1999-03-08","date":"1998-09-01","document_id":"867402","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)","mfr_system":null,"summary":"COMMENTS ABOUT A MOAN TYPE NOISE WHEN THE VEHICLE IS OPERATED IN THE AUTO 4WD POSITION AND IS DRIVEN IN DEEP SAND, DEEP SNOW, OR DEEP MUD. *YC","document":null,"url":"https://open.wenmarpro.com/bulletins/603827","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null},{"id":"transfer-case","name":"Transfer case","parent":"powertrain"}],"codes":[],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"K SERIES","year_from":1998,"year_to":1998,"match":null,"vehicle_ids":[]},{"make":"GMC","model":"K SERIES","year_from":1998,"year_to":1998,"match":null,"vehicle_ids":[]},{"make":"OLDSMOBILE","model":"BRAVADA","year_from":1998,"year_to":1998,"match":"exact","vehicle_ids":["1998_oldsmobile_bravada"]}],"as_of":"2026-10-19","note":"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.","attribution":[]}