What are the best MPG mods you guys have seen with the 6.4L? I have an '08 6.4L dually with SCT tuner & DPF/Cat delete and my MPGs went from ~10.5 to 14. Any suggestions on further improvements?
What for gears do the duallys have and what should he go to?
Most DRW F-350's come with 4.10 gears. I think a few MAY have been equipped with 4.30's, but that isn't standard. The only DRW trucks with 4.88's are F-450's and F-550's. After 2008, standard for F-250's became 3.55's and I think SRW F-350's were both 3.73 and 3.55's.I believe they are like 4.88, you could go lower but keep in mind, changing your gear ratio will affect your towing capacity.
As a comparison, the F250 comes with 3.73 std.