{"nhtsa_id":10079302,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2016-09-07","date":"2015-01-05","document_id":"G-207959","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN:AUTOMATIC TRANSMISSION","mfr_system":null,"summary":"14308 - SPECIAL COVERAGE. HEAVY DUTY DIESEL POWERED VEHICLES EQUIPPED WITH A 6 SPEED AUTOMATIC TRANSMISSION, MAY HAVE A CONDITION IN WHICH INCREASED TRANSMISSION OIL COOLING CIRCUIT PRESSURE MAY CAUSE TRANSMISSION FLUID TO WEEP OR LEAK. THIS LOSS OF FLUID OCCURS NEAR THE TRANSMISSION COOLER AT THE CRIMP JOINTS ON THE METAL ENDS OF THE COOLER LINE WHERE IT JOINS THE RUBBER HOSE. THE INCREASED OIL COOLING CIRCUIT PRESSURE IS EXPERIENCED DURING VEHICLE OPERATION AT EXTREME LOW OUTDOOR TEMPERATURES. IF CONDITION OCCURS WITHIN STATED SPECIAL COVERAGE TERMS, THE COOLER LINES WILL BE REPLACED","document":null,"url":"https://open.wenmarpro.com/bulletins/10079302","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null},{"id":"automatic-transmission","name":"Automatic transmission","parent":"powertrain"}],"codes":[],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"SILVERADO 1500","year_from":2008,"year_to":2008,"match":"base","vehicle_ids":["2008_chevrolet_silverado"]},{"make":"GMC","model":"SIERRA 1500","year_from":2008,"year_to":2008,"match":"base","vehicle_ids":["2008_gmc_sierra"]}],"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":[]}