{"nhtsa_id":634306,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2002-09-08","date":"2002-07-01","document_id":"241K2K02","mfr_campaign":null,"replaces":null,"component":"UNKNOWN OR OTHER","mfr_system":null,"summary":"INFORMATION REGARDING MODEL YEAR 2003 HARDWARE IMPROVEMENTS, ALL ALLISON MODELS 1000,2000, AND 2400 SERIES.*JB","document":null,"url":"https://open.wenmarpro.com/bulletins/634306","components":[],"codes":[],"topics":[],"vehicles":[{"make":"GMC","model":"GM","year_from":null,"year_to":null,"match":null,"vehicle_ids":[]}],"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":[]}