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  1. S

    2.8 to 3.4 mpg

    i'm swapping my 2.8 to a 3.4 in my 86 chief that has 4.11 gears. do i need to change to overdrive also or will the mileage be ok with the 3 speed 904. i'm building a daily driver and need as good mpg as possible.
  2. S

    2.8 to 3.4 gas mileage

    i'm swapping my 2.8 to a 3.4 in my 86 chief that has 4.11 gears. do i need to change to overdrive also or will the mileage be ok with the 3 speed 904. i'm building a daily driver and need as good mpg as possible.
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