{"nhtsa_id":631800,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2002-06-20","date":"2006-09-01","document_id":"020730004","mfr_campaign":null,"replaces":"020730004C","component":"POWER TRAIN:AUTOMATIC TRANSMISSION","mfr_system":null,"summary":"NEW PRODUCT INFORMATION, GRADE BRAKE FEATURE OF ALLISON 1000 SERIES TRANSMISSION. *SLC THIS BULLETIN REPLACES 02-07-30-004. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/631800","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null},{"id":"automatic-transmission","name":"Automatic transmission","parent":"powertrain"}],"codes":[],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"SILVERADO","year_from":2001,"year_to":2005,"match":"exact","vehicle_ids":["2001_chevrolet_silverado","2002_chevrolet_silverado","2003_chevrolet_silverado","2004_chevrolet_silverado","2005_chevrolet_silverado"]},{"make":"GMC","model":"SIERRA","year_from":2001,"year_to":2005,"match":"exact","vehicle_ids":["2001_gmc_sierra","2002_gmc_sierra","2003_gmc_sierra","2004_gmc_sierra","2005_gmc_sierra"]}],"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":[]}