In 2001, International introduced the NGV (Next Generation Vehicle) line of trucks, with an all-new 4000-series medium-duty truck line. For the 2005 model year, the 3300 was introduced as the replacement for the International 3800 (the final model of the long-running
International S-Series). The 3300 shares its powertrain and forward body components with the 4300 medium-duty truck (the replacement for the 4900). Though remaining under the same model nomenclature since 2004, the 3300 has followed the model development of the International DuraStar.
Body manufacturers As an effect of the alignment between industry chassis suppliers and school bus body manufacturers, production of the International 3300 has been more directly associated with IC Bus than its 3800 predecessor. From 2004 to 2008, the 3300 was also bodied by Blue Bird Corporation, who offered it as an additional model alongside its proprietary
Blue Bird Vision conventional. Since 2009, the 3300 chassis has been bodied by IC Bus exclusively in the United States and Canada. Navistar also manufactured the chassis for export, though body manufacturers outside North America did not produce school bus bodies for the chassis.
Powertrain At the time of its introduction, the International 3300 was sold exclusively with Navistar-sourced diesel engines. For 2008 production, the VT365 and DT466 engines were replaced by the MaxxForce 7 and MaxxForce DT engines, respectively. Introduced as an option during 2013, Cummins ISB6.7 diesels became the standard diesel engine during 2015. In 2015, the 3300 expanded to alternative-fuel powertrains, as Navistar introducing a PSI-supplied (Power Solutions International) propane-fuel engine; in 2017, the same engine became available fueled by gasoline. In 2018, IC Bus introduced a prototype fully-electric bus based on a 3300 chassis, named chargE; the production of the fully-electric vehicle is intended for 2020. == Variants ==