I am trying to find a higher gear ratio like 4.11 or 3.73 are they avaliable? How much? Where? I have 4.88 and top speedd is about 70 on the highway it turns my two hour drive into 2.5 and uses a lot more diesel. Any other thoughts would be great also. I would rade for a 350 but cannot seem to find one and cannot sell the truck for what I want and replace it.