I am running a 350/465/205 with 14bff/10b with 4.56 Gears. Does anyone think this is to low or what. My truck is not a dd but i do use the highway a lot. @ 70 mph i am turning 3000 rpms and at 80 i am turning about 3500 rpms. I have a set of 3.73 gears for both my axels but should i swap or not.