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The ring and pinion set in the actual rear end is the "final drive". I have seen up to a 4:30 ratio offered. Haven't found exact info on our cars to know what came in the car from the factory. I think we have a 4:10 in the car now. The switch to the 4:30 set will effectively shorten all of gear ratios and in turn make the car accelerate quicker. There are trade offs in cruising rpm being higher and probably a little mpg hit.
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