Before your add a Leveling Kit or Lift Kit and Larger Wheels and Tires First off I want to start with how to get correct final ratios. Remember that for most trucks was a 265/75 R16 tire... Like my truck came with 265/75 R16 tires even though the door sticker states 245/75 R16. The 245/75 R16 was used in the early 24V body design. The most common axle is 3.55 gears. If you are going to use a larger than stock tire makes sure to have 4.10 gears. Its a REQUIREMENT! Final Ratio Goals