{"nhtsa_id":634968,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2002-10-10","date":"2002-05-01","document_id":"020730017","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN:AUTOMATIC TRANSMISSION","mfr_system":null,"summary":"CONCERN WITH NO SHIFT, HARSH SHIFT, NO ENGAGEMENT, TRANSMISSION IN DEFAULT, CHECK TRANSMISSION WARNING INDICATOR ILLUMINATED, RANGE INHIBITED INDICATOR ILLUMINATED, TRANSMISSION DIAGNOSTIC TROUBLE CODES SET ON F-MODEL MEDIUM DUTY TILT CAB MODELS. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/634968","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null},{"id":"automatic-transmission","name":"Automatic transmission","parent":"powertrain"}],"codes":[],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"T SERIES","year_from":1997,"year_to":2002,"match":"exact","vehicle_ids":["1997_chevrolet_t-series","1998_chevrolet_t-series","1999_chevrolet_t-series","2000_chevrolet_t-series","2001_chevrolet_t-series","2002_chevrolet_t-series"]},{"make":"GMC","model":"T SERIES","year_from":1997,"year_to":2002,"match":"exact","vehicle_ids":["1997_gmc_t-series","1998_gmc_t-series","1999_gmc_t-series","2000_gmc_t-series","2001_gmc_t-series","2002_gmc_t-series"]}],"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":[]}