{"nhtsa_id":10006811,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2004-05-14","date":"2004-03-01","document_id":"04019","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN","mfr_system":null,"summary":"4L80E / 4L85E TRANSMISSION MAY HAVE A CONDITION IN WHICH THE TRANSMISSION OVERDRIVE GEAR SET MAY FAIL DUE TO INADEQUATE LUBRICATION AS A RESULT OF A TRANSMISSION CASTING CHANGE. CUSTOMER SATISFACTION PROGRAM BULLETIN. ALSO TO INCLUDE 2004 CHEVROLET AND GMC W3500, W4500, AND ISUZU NPR, NPR-HD. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/10006811","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"AVALANCHE","year_from":2004,"year_to":2004,"match":"exact","vehicle_ids":["2004_chevrolet_avalanche"]},{"make":"CHEVROLET","model":"EXPRESS","year_from":2004,"year_to":2004,"match":"exact","vehicle_ids":["2004_chevrolet_express"]},{"make":"CHEVROLET","model":"SILVERADO","year_from":2004,"year_to":2004,"match":"exact","vehicle_ids":["2004_chevrolet_silverado"]},{"make":"CHEVROLET","model":"SUBURBAN","year_from":2004,"year_to":2004,"match":"exact","vehicle_ids":["2004_chevrolet_suburban"]},{"make":"GMC","model":"SAVANA","year_from":2004,"year_to":2004,"match":"exact","vehicle_ids":["2004_gmc_savana"]},{"make":"GMC","model":"SIERRA","year_from":2004,"year_to":2004,"match":"exact","vehicle_ids":["2004_gmc_sierra"]},{"make":"GMC","model":"YUKON XL","year_from":2004,"year_to":2004,"match":"exact","vehicle_ids":["2004_gmc_yukon-xl"]}],"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":[]}