{"nhtsa_id":6088678,"type":"service_bulletin","type_name":"Service bulletin","date_added":"1999-12-29","date":"1999-10-01","document_id":"990309003","mfr_campaign":null,"replaces":null,"component":"SUSPENSION","mfr_system":null,"summary":"VEHICLES WITH 4L60-E AUTOMATIC TRANSMISSIONS MAY EXHIBIT VIBRATION DURING ACCELERATION FROM 0 - 40 KM/H (0-25 MPH). *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/6088678","components":[{"id":"suspension","name":"Suspension","parent":null}],"codes":[],"topics":[],"vehicles":[{"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":"CHEVROLET","model":"SILVERADO 1500","year_from":1999,"year_to":1999,"match":"base","vehicle_ids":["1999_chevrolet_silverado"]},{"make":"GMC","model":"SIERRA","year_from":1999,"year_to":1999,"match":"exact","vehicle_ids":["1999_gmc_sierra"]},{"make":"GMC","model":"SIERRA 1500","year_from":1999,"year_to":1999,"match":"base","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":[]}