Seems i cant do many engine mods without some major cash, so im lookin at electornic and tranny horses. Im sure my car has 3:27's in the rear end, at first gear at 4800 rpm im runnin 50 mph, second gear gets me 85, 3rd gear gets me to 110 and its shut off. I was readin where 5 speed ppl are happy with 3:73's and Auto's are happier with 4:10's. Im just curious, because i do a lot of cruising and i dont want to kill my gas mileage, but i want more bottom end than i have now. im gonna order a posi for the rear end off ebay and a ring and pinion gear. What all is needed to drop in a posi and gears? and what gears should i go with, i want more takeoff but dont want to be wound out in 3rd gear at 70 mph. ring now at 60 mph im runnin 1300 rpm, which is a good thing, but it takes me a while to get there, i raced a mazda miata ( older model ) and when he hit 4th gear i had just hit second at 80 mph... so thats kinda sayin i got some airplane gears. I want to go fast, but i was to get there fast as well. so 3:73 or 4:10?