{"nhtsa_id":10201640,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2021-09-30","date":"2021-09-24","document_id":"21B04","mfr_campaign":null,"replaces":null,"component":"STRUCTURE","mfr_system":null,"summary":"Certain 2017 through 2020 Model Year F550 Equipped with Payload Plus Upgrade Package ;Frame Rail Crack In some of the affected vehicles certain second unit body (SUB) upfits could cause stress points on the frame rail. Over time this stress could cause a crack in the frame rail behind the cab.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10201640-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10201640-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10201640","components":[{"id":"structure-body","name":"Body and frame","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"FORD","model":"F-550","year_from":2017,"year_to":2020,"match":"exact","vehicle_ids":["2017_ford_f-550","2018_ford_f-550","2019_ford_f-550","2020_ford_f-550"]}],"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":[]}