The new positions include mechanical, electrical, systems and software engineers. The jobs are a mix of entry-level, management and contract positions.
Navistar has 1,100 employees at the site.
Spokesman Roy Wiley said the additional workers are needed to help the company meet more-stringent diesel engine emission standards effective in 2010. The new employees also will be involved in a new partnership between Navistar and Caterpillar Inc. in which Navistar will supply service trucks to the Illinois-based heavy equipment maker.