{"nhtsa_id":619378,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2001-05-24","date":"2001-04-01","document_id":"990421003B","mfr_campaign":null,"replaces":"990421003A","component":"POWER TRAIN:DRIVELINE:DIFFERENTIAL UNIT","mfr_system":null,"summary":"SOME OWNERS MAY COMMENT ON A SLIPPING TYPE CONDITION AT THE FRONT WHEELS WHILE THE VEHICLE IS IN FOUR WHEEL DRIVE (4WD). *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/619378","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null},{"id":"differential","name":"Differential","parent":"powertrain"}],"codes":[],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"BLAZER","year_from":1999,"year_to":2001,"match":"exact","vehicle_ids":["1999_chevrolet_blazer","2000_chevrolet_blazer","2001_chevrolet_blazer"]},{"make":"CHEVROLET","model":"SILVERADO","year_from":1999,"year_to":2001,"match":"exact","vehicle_ids":["1999_chevrolet_silverado","2000_chevrolet_silverado","2001_chevrolet_silverado"]},{"make":"GMC","model":"ENVOY","year_from":1999,"year_to":2001,"match":null,"vehicle_ids":[]},{"make":"GMC","model":"JIMMY","year_from":1999,"year_to":2001,"match":null,"vehicle_ids":[]},{"make":"GMC","model":"SIERRA","year_from":1999,"year_to":2001,"match":"exact","vehicle_ids":["1999_gmc_sierra","2000_gmc_sierra","2001_gmc_sierra"]}],"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":[]}