Thing is, i knew they were cheap, and that it was a posi and that it would fit my car, so i said, why not. Even if i don't use them, i could probably sell them for 600. Its a brand new auburn!! I have never had new gears on my car, so that's why i'm asking all these questions. I don't know what experiences i'll run into. Is there a chance that it would go past 120 on the highway, because i have a buddy that runs a 3.55 posi, on a 93 dodge dakota with a 5.2 and no major mods, and goes past 180km/h no problem.