{"nhtsa_id":606085,"type":"service_bulletin","type_name":"Service bulletin","date_added":"1999-08-06","date":"1999-06-01","document_id":"990730009","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN:AUTOMATIC TRANSMISSION","mfr_system":null,"summary":"SUBJECT PERTAINING TO HARSH 1 - 2 AND 3 - 2 SHIFTS. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/606085","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null},{"id":"automatic-transmission","name":"Automatic transmission","parent":"powertrain"}],"codes":[],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"C SERIES","year_from":1999,"year_to":1999,"match":null,"vehicle_ids":[]},{"make":"CHEVROLET","model":"K SERIES","year_from":1999,"year_to":1999,"match":null,"vehicle_ids":[]},{"make":"CHEVROLET","model":"SIERRA","year_from":1999,"year_to":1999,"match":null,"vehicle_ids":[]},{"make":"CHEVROLET","model":"SILVERADO","year_from":1999,"year_to":1999,"match":"exact","vehicle_ids":["1999_chevrolet_silverado"]},{"make":"GMC","model":"C SERIES","year_from":1999,"year_to":1999,"match":null,"vehicle_ids":[]},{"make":"GMC","model":"K SERIES","year_from":1999,"year_to":1999,"match":null,"vehicle_ids":[]},{"make":"GMC","model":"SIERRA","year_from":1999,"year_to":1999,"match":"exact","vehicle_ids":["1999_gmc_sierra"]},{"make":"GMC","model":"SILVERADO","year_from":1999,"year_to":1999,"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":[]}