Looking @ a volvo 2015 its got a tranmission ATO2612D in it which is overdrive. The rear ends are 2.64. The hp is 455. Curious about longhauling with that kind of truck and at 65mph what rpms would i be doing? I cruise at 65 everywhere dont understand these new ratios as i ran only 13pds any know aprx rpms for 65 for this 2.64 ishift setup? Thnks also Flatbeds we typically haul 40k loads.