{"nhtsa_id":601387,"type":"service_bulletin","type_name":"Service bulletin","date_added":"1998-08-03","date":"1998-05-27","document_id":"98052704B002","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING:ENGINE","mfr_system":null,"summary":"A REAR FRAME ARRANGEMENT AND ASSOCIATED PARTS ARE AVAILABLE THROUGH THE MACK PARTS SYSTEM TO REPLACE THE TRUNNION BRACKET ON AN SS440 OR SS441 SERIES SUSPENSION WITH AN S501 TRUNNION BRACKET. *YC","document":null,"url":"https://open.wenmarpro.com/bulletins/601387","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"MACK","model":"DM SERIES","year_from":null,"year_to":null,"match":null,"vehicle_ids":[]},{"make":"MACK","model":"DMM SERIES","year_from":null,"year_to":null,"match":"base","vehicle_ids":[]},{"make":"MACK","model":"MR SERIES","year_from":null,"year_to":null,"match":null,"vehicle_ids":[]},{"make":"MACK","model":"RD SERIES","year_from":null,"year_to":null,"match":null,"vehicle_ids":[]},{"make":"MACK","model":"RM 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":[]}