mechrisme

I was browsing online about seeing if I were to swap a 5 speed into my truck, I discovered with this app I will have higher RPMs about 1000. Also I can get better mileage with bigger tires, I am not sure if these will exactly works since its up a 4 speed manual tranny but you can change the final gear ratio. Heres the link to the site and see if you think it seems correct, it does with my current setup..

http://vexer.com/automotive-tools/speed-rpm-calculator