{"nhtsa_id":45902,"type":"service_bulletin","type_name":"Service bulletin","date_added":"1996-04-25","date":"1995-07-01","document_id":"CAMP95C1","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN:AUTOMATIC TRANSMISSION:TORQUE CONVERTER","mfr_system":null,"summary":"ALLISON TRANSMISSION HAS DETERMINED THAT VEHICLES WHICH UTILIZE THE B 500/HD 4000 SERIES TRANSMISSION TORQUE CONVERTER HOUSING SIDE MOUNT PADS TO SUPPORT THE POWERPACK MAY CREATE A CRACK AROUND THE MOUNTING PAD. THIS CRACK MAY EVENTUALLY CAUSE THE PAD TO BREAK AWAY FROM THE CONVERTER HOUSING. TO CORRECT THIS SITUATION, A CASTING CHANGE ON THE TORQUE CONVERTER HOUSING WAS INTRODUCED INTO PRODUCTION BEGINNING WITH S/N 6610001371 FOR STANDARD TORQUE CONVERTER HOUSINGS AND S/N 6610001865 FOR PTO TORQUE CONVERTER HOUSINGS.*SD","document":null,"url":"https://open.wenmarpro.com/bulletins/45902","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null},{"id":"automatic-transmission","name":"Automatic transmission","parent":"powertrain"},{"id":"torque-converter","name":"Torque converter","parent":"powertrain"}],"codes":[],"topics":[],"vehicles":[{"make":"ALLISON DIV","model":"ALLISON DIV","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":[]}