{"nhtsa_id":602989,"type":"service_bulletin","type_name":"Service bulletin","date_added":"1999-01-25","date":"1998-11-01","document_id":"867118","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN:AUTOMATIC TRANSMISSION","mfr_system":null,"summary":"ERRATIC OR PREMATURE UPSHIFTS, HARSH DOWN SHIFTS, ENGINE LUGGING, OR LOW POWER PERFORMANCE. *YC","document":null,"url":"https://open.wenmarpro.com/bulletins/602989","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null},{"id":"automatic-transmission","name":"Automatic transmission","parent":"powertrain"}],"codes":[],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"B7","year_from":1998,"year_to":1998,"match":"exact","vehicle_ids":["1998_chevrolet_b7"]},{"make":"CHEVROLET","model":"C6500","year_from":1998,"year_to":1998,"match":null,"vehicle_ids":[]},{"make":"CHEVROLET","model":"C7500","year_from":1998,"year_to":1998,"match":null,"vehicle_ids":[]},{"make":"GMC","model":"B7","year_from":1998,"year_to":1998,"match":"exact","vehicle_ids":["1998_gmc_b7"]},{"make":"GMC","model":"C6500","year_from":1998,"year_to":1998,"match":null,"vehicle_ids":[]},{"make":"GMC","model":"C7500","year_from":1998,"year_to":1998,"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":[]}