{"nhtsa_id":630231,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2002-04-15","date":"2001-10-01","document_id":"15319","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN:DRIVELINE:DIFFERENTIAL UNIT","mfr_system":null,"summary":"SOME VEHICLES BUILT BEFORE JUNE 8, 2000 AND EQUIPPED WITH A4WD MAY EXHIBIT A HIGH-SPEED MOAN OR DRIVELINE PULSATION/SHUDDER. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/630231","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null},{"id":"differential","name":"Differential","parent":"powertrain"}],"codes":[],"topics":[],"vehicles":[{"make":"FORD","model":"EXPEDITION","year_from":1999,"year_to":2000,"match":"exact","vehicle_ids":["1999_ford_expedition","2000_ford_expedition"]},{"make":"LINCOLN","model":"NAVIGATOR","year_from":1999,"year_to":2000,"match":"exact","vehicle_ids":["1999_lincoln_navigator","2000_lincoln_navigator"]}],"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":[]}