The rear gear on my frontier is way to high at 4.636 to 1. I want to decrease it to lower the RPM's that it runs at in high gear. Right now on the highway at 70 MPH in 5th gear it runs 3000 RPM's. I have not been able to find a lower rear gear to put in it and am wondering if y'all can help me. It is a 2004 Nissan Frontier xe-v6 5 speed with 2 wheel drive.