Wonder if this the right discussion thread for this size truck ? Just purchased this truck, seems to be hard shifting ( 6 speed, dealer indicated a Fuller Trans ) , haven't checked the fluid level yet, but is some grinding when it feels like I'm forcing into gears. So, does it sound like syncronizers need replacing ? ( Has 106 K miles on it ). What type of fluid required for this one (will obviously check level before decide to tear down ) ? Most noticeable in 1st, sometimes does not want to come out of gear, appears have to be at correct RPM. Any advice appreciated. Anywhere I can purchase a manual, or visit a website (perhaps manufacturer) where I can get any info ?