Navistar (Navistar) is recalling certain model year 2016 International ProStar trucks manufactured January 5, 2015, to January 7, 2015, and 2016 International TranStar trucks manufactured on January 6, 2015, and equipped with certain Eaton Fuller FR-Series 10-speed manual transmissions. When the transmission shift lever is moved from reverse to neutral, the reverse gear may stay engaged. When the transmission shift lever is moved from reverse to a forward gear position, the transmission may mechanically lock because both the reverse gear and forward gear are simultaneously engaged.