{"nhtsa_id":10205139,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2021-12-20","date":"2021-11-12","document_id":"18TR21","mfr_campaign":null,"replaces":null,"component":"EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT; POWER TRAIN","mfr_system":null,"summary":"Service information announcing that the standard duty retarder rotor will be replaced by the heavy duty retarder rotor.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10205139-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10205139-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10205139","components":[{"id":"equipment","name":"Equipment and accessories","parent":null},{"id":"powertrain","name":"Transmission and driveline","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"ALLISON","model":"TRANSMISSION","year_from":null,"year_to":null,"match":null,"vehicle_ids":[]}],"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":[]}