{"nhtsa_id":10078803,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2016-08-19","date":"2016-04-26","document_id":"SB-39370","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN:MANUAL TRANSMISSION","mfr_system":null,"summary":"39370 – SERVICE UPDATE BULLETIN. ON VEHICLES EQUIPPED WITH AN 8-SPEED AUTOMATIC TRANSMISSION, THE C-1-3-5-6-7 PISTON ASSEMBLY INTERNAL TO THE TRANSMISSION MAY BE OUT OF SPECIFICATION RESULTING IN POTENTIAL SHIFT QUALITY AND LONG TERM DURABILITY ISSUES. DEALERS ARE TO REPLACE THE TRANSMISSION.","document":null,"url":"https://open.wenmarpro.com/bulletins/10078803","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null},{"id":"manual-transmission","name":"Manual transmission","parent":"powertrain"}],"codes":[],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"SILVERADO 1500","year_from":2016,"year_to":2016,"match":"base","vehicle_ids":["2016_chevrolet_silverado"]},{"make":"GMC","model":"SIERRA 1500","year_from":2016,"year_to":2016,"match":"base","vehicle_ids":["2016_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":[]}