{"nhtsa_id":10114234,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2017-08-15","date":"2016-11-21","document_id":"G-179736","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN:AXLE ASSEMBLY","mfr_system":null,"summary":"13397 - Customer Satisfaction. Certain vehicles were built with a 3.73 rear axle ratio instead of a 3.42 ratio. With the incorrect rear axle, the speedometer and odometer will indicate 9% above the true value and the transmission shift points will be set for a 3.42 ratio. Dealers are to install a new rear axle with a 3.42 ratio. GM will extend the vehicle mileage warranty as appropriate for accrued mileage on sold vehicles","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2016/MC-10114234-9999.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2016/MC-10114234-0001.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10114234","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null},{"id":"axle","name":"Axle","parent":"powertrain"}],"codes":[],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"EXPRESS","year_from":2014,"year_to":2014,"match":"exact","vehicle_ids":["2014_chevrolet_express"]},{"make":"GMC","model":"SAVANA","year_from":2014,"year_to":2014,"match":"exact","vehicle_ids":["2014_gmc_savana"]}],"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":[]}