{"nhtsa_id":10189781,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2021-04-03","date":"2021-03-10","document_id":"TSB 21-2064","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN","mfr_system":null,"summary":"Some 2015-2021 Transit vehicles equipped with rear wheel drive (RWD), single rear wheel (SRW), and a U-joint at the transmission flange and rear driveshaft may experience a boom/hum/moan noise or vibration from the rear while driving. This noise or vibration is most prevalent at highway speeds (112-121 km/h 7075 mph for 4.10 axle ratio, 121-128 km/h 75-80 mph for 3.73 axle ratio, and 136-145 km/h 85-90 mph for 3.31 axle ratio) and may also be present to a lesser degree at roughly half of those speeds. This may be due to a 2nd order driveline frequency transmitted through the rear drive shaft, rear axle and into the body through the leaf springs. To correct the condition, follow the Service Procedure to install a driveshaft torsional damper.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10189781-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10189781-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10189781","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"FORD","model":"TRANSIT","year_from":2015,"year_to":2021,"match":"exact","vehicle_ids":["2015_ford_transit","2016_ford_transit","2017_ford_transit","2018_ford_transit","2019_ford_transit","2020_ford_transit","2021_ford_transit"]}],"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":[]}