The larger the ratio the faster the acceleration between gears, but the overall top speed of each gear is reduced. For instance a 3.91 ratio produces neck snapping acceleration, but isn't practical for highway use- the overall top speed is reduced but it will get you to top speed a hell of a lot quicker. YOu can get a used 3.15LSD for about $400. Anything higher has to be custom built and are about $1500. They are not too bad to install- this can even be a DIY if you have the courage. Performance wise a 3.46 LSD and JC chip has been documented to shave at least a second off your 0-60 time
Edit: A custom LSD is the next best thing to do outside of forced induction to improve acceleration. If your like me and rarely go over 100mph this is somehting to surely look into.
Complete mod list and pics:
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