{"nhtsa_id":10007668,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2004-07-07","date":"2004-01-01","document_id":"01586","mfr_campaign":null,"replaces":"01586A","component":"ENGINE AND ENGINE COOLING:ENGINE","mfr_system":null,"summary":"8.1L CHANGES IN HEADS, BOLTS AND GASKET FOR FOR 2004 1/2 ENGINES. VARIOUS MODELS INCLUDING THE CHEVROLET AND GMC 2500HD/3500 MY2001-2004 AND 2001, 2002, AND 2003 GMT 560. *MJ","document":null,"url":"https://open.wenmarpro.com/bulletins/10007668","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"AVALANCHE","year_from":2002,"year_to":2004,"match":"exact","vehicle_ids":["2002_chevrolet_avalanche","2003_chevrolet_avalanche","2004_chevrolet_avalanche"]},{"make":"CHEVROLET","model":"SUBURBAN","year_from":2001,"year_to":2004,"match":"exact","vehicle_ids":["2001_chevrolet_suburban","2002_chevrolet_suburban","2003_chevrolet_suburban","2004_chevrolet_suburban"]},{"make":"GMC","model":"SIERRA","year_from":2001,"year_to":2004,"match":"exact","vehicle_ids":["2001_gmc_sierra","2002_gmc_sierra","2003_gmc_sierra","2004_gmc_sierra"]},{"make":"GMC","model":"YUKON","year_from":2001,"year_to":2004,"match":"exact","vehicle_ids":["2001_gmc_yukon","2002_gmc_yukon","2003_gmc_yukon","2004_gmc_yukon"]}],"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":[]}