ok so official thread hijack here but.... the whole rearend gears and things like that scare me and i have never wanted to even attempt anything back there but, correct me if im wrong.... you have your rear end gears ie 3.42's... then i can keep my 3.42 and just add a posi unit in there as well?? or is it a whole set that i have to change it all out... i know going with taller gears will help me scoot off the line, but i drive ALOT of highway and enjoy being able to cruise at 2400 rpm @ 95 mph