Got a 2018 579 x15 cummins 500hp Efficiency Series . It has a 9 speed trans that was converted to 13 speed. Has 3.25 rearends. I want to upgrade to a 18 speed. What would be the best rearends to go along with it ? Best clutch as well ? I drive mainly in the Midwest ( Iowa, Nebraska, South Dakota ) then during spring and fall go out west ( Montana ) . I haul cattle so typically loads are pretty heavy . Pulling a quad axle trailer . What would be the ideal set up here?
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3.25 rearends 9 speed Trans Converted to 13 speed. Want to upgrade
