{"nhtsa_id":606833,"type":"service_bulletin","type_name":"Service bulletin","date_added":"1999-09-03","date":"1999-06-01","document_id":"6408","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN:AXLE ASSEMBLY","mfr_system":null,"summary":"SOME VEHICLES WITH 4X4 OPTION WHILE OPERATING IN 4X2 MODE MAY EXHIBIT A LIGHT OR A ROLLING THUMP / BUMP SENSATION ON SLIGHT TO MODERATE ACCELERATION AND DECELERATION. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/606833","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null},{"id":"axle","name":"Axle","parent":"powertrain"}],"codes":[],"topics":[],"vehicles":[{"make":"FORD","model":"RANGER","year_from":1998,"year_to":1999,"match":"exact","vehicle_ids":["1998_ford_ranger","1999_ford_ranger"]}],"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":[]}