{"nhtsa_id":10012730,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2005-03-12","date":"2005-08-01","document_id":"040730040","mfr_campaign":null,"replaces":"040730040A","component":"POWER TRAIN:AUTOMATIC TRANSMISSION","mfr_system":null,"summary":"HARSH 2-1 DOWNSHIFT OR 1-2 UPSHIFT. 2004 CHEVROLET EPICA, OPTRA. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/10012730","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null},{"id":"automatic-transmission","name":"Automatic transmission","parent":"powertrain"}],"codes":[],"topics":[],"vehicles":[{"make":"UNKNOWN","model":"UNKNOWN","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":[]}