{"nhtsa_id":609054,"type":"service_bulletin","type_name":"Service bulletin","date_added":"1999-12-07","date":"1999-08-01","document_id":"9913141","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN","mfr_system":null,"summary":"VEHICLES THAT HAVE HAD A REAR AXLE RATIO CHANGED, GEM MODULE REPLACED, AND / OR TIRE SIZE CHANGE MAY HAVE AN INACCURATE OR INOPERABLE SPEEDOMETER. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/609054","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"FORD","model":"F-650","year_from":2000,"year_to":2000,"match":"exact","vehicle_ids":["2000_ford_f-650"]},{"make":"FORD","model":"F750","year_from":2000,"year_to":2000,"match":"exact","vehicle_ids":["2000_ford_f-750"]}],"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":[]}