gears wont do anything. except waste money. im guessing you have a 04 ram by your info. are you wanting more power for fun or purpose? once you get that figured out. then choose which way you want to create boost. i know they make a turbo and blower kit for that motor. i would go roots style supercharger. but if money is a issue and it usally is. just slap a nice intake and exhaust on it. i have a 04 ram with the hemi and i put a borla leg spreader exhaust on it. and i just put a AEM Brute Force intake on it!!!! im not sure aem makes one for you motor but im sure you can find a company that makes a descent one.