{"nhtsa_id":10232783,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2023-03-13","date":"2023-01-30","document_id":"SIL-16-WT-20","mfr_campaign":null,"replaces":null,"component":"STRUCTURE","mfr_system":null,"summary":"Service letter providing notice of redesigned piston seals and piston, air solenoid valve nipple, and air solenoid valve fitting","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2023/MC-10232783-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2023/MC-10232783-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10232783","components":[{"id":"structure-body","name":"Body and frame","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"ALLISON","model":"3000 SERIES TRANSMISSION","year_from":null,"year_to":null,"match":null,"vehicle_ids":[]},{"make":"ALLISON","model":"4000 SERIES TRANSMISSION","year_from":null,"year_to":null,"match":null,"vehicle_ids":[]},{"make":"ALLISON","model":"B SERIES","year_from":null,"year_to":null,"match":null,"vehicle_ids":[]},{"make":"ALLISON","model":"B300","year_from":null,"year_to":null,"match":null,"vehicle_ids":[]},{"make":"ALLISON","model":"B400","year_from":null,"year_to":null,"match":null,"vehicle_ids":[]},{"make":"ALLISON","model":"H 40 EP TRANSMISSION","year_from":null,"year_to":null,"match":null,"vehicle_ids":[]},{"make":"ALLISON","model":"H 50 EP TRANSMISSION","year_from":null,"year_to":null,"match":null,"vehicle_ids":[]},{"make":"ALLISON","model":"T SERIES","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":[]}