{"nhtsa_id":637389,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2002-11-25","date":"2002-01-01","document_id":"41","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN:AUTOMATIC TRANSMISSION","mfr_system":null,"summary":"SUBJECT REGARDING TRANSMISSION COLD SHIFT CONDITIONS ON SOME 1999 - 2000 VEHICLES EQUIPPED WITH THE 4T65E AUTOMATIC TRANSMISSION. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/637389","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null},{"id":"automatic-transmission","name":"Automatic transmission","parent":"powertrain"}],"codes":[],"topics":[],"vehicles":[{"make":"GMC","model":"GM","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":[]}