{"nhtsa_id":10121640,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2017-11-03","date":"2016-07-06","document_id":"21-025-16","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN; POWER TRAIN:AUTOMATIC TRANSMISSION:TORQUE CONVERTER","mfr_system":null,"summary":"Transmission Torque Converter Replacement After Drone Noise Verification This bulletin involves test driving the vehicle to listen for audible ?drone? noise at approximately 2,000 RPM. If drone noise is verified, normal torque converter replacement should be performed. The customer may describe a ?heavy droning noise? coming from the vehicle at an engine speed range of 1,800 RPM to 2,000 RPM with mid to deep throttle applied.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2016/MC-10121640-9999.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2016/MC-10121640-0001.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10121640","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null},{"id":"automatic-transmission","name":"Automatic transmission","parent":"powertrain"},{"id":"torque-converter","name":"Torque converter","parent":"powertrain"}],"codes":[],"topics":[],"vehicles":[{"make":"RAM","model":"3500","year_from":2013,"year_to":2016,"match":"exact","vehicle_ids":["2013_ram_3500","2014_ram_3500","2015_ram_3500","2016_ram_3500"]}],"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":[]}