{"nhtsa_id":618159,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2001-04-06","date":"2001-01-04","document_id":"040101","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN:DRIVELINE:DIFFERENTIAL UNIT","mfr_system":null,"summary":"SOME CUSTOMERS MAY COMPLAIN ABOUT DRIVELINE CLUNK WITH ACCELERATING AND / OR DECELERATING ON 1990 TO 2001 MEDIUM DUTY TRUCKS EQUIPPED WITH NO SPIN DIFFERENTIALS. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/618159","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null},{"id":"differential","name":"Differential","parent":"powertrain"}],"codes":[],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"CHEVROLET TRUCK","year_from":null,"year_to":null,"match":null,"vehicle_ids":[]},{"make":"GMC","model":"GMC TRUCK","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":[]}