Deeper gears offer more mechanical advatage as long as you can make hp at where your turning it to. I have all to much fiqured this out with the stock camshaft, ive played with many diff. ratios in the ol 9" ford, diesels just have a flat narrow torq. band and can make gearing a challange. Find what works for you and do that! It has a ton to do with your tranny gearing, tire height, and hp/torq. Order you a Power Speed Calculator #89650, from summit or jegs thier cheap and have helped me tons with gearing decisions for many years. Ryan