I ran my 99 sport v6 5spd ext cab at our local 1/8 mile track last night. My times wern't what i expected. An 11.8 was my best. Any shifting tips or launching tips because i was lost at what rpms to start at and whats a good rpm to shift at. The only mods I have are short ram intake, RT throttle body. Would i see any improvments from a posi rear end? Better tires, headers and exhaust? I have 3:21 gears.