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anther way to squeeze some mpgs out of the 4.0 is to convert the cooling fan to electrical one out of early 90's taurus are basically bolt in when i did the swap on my old ranger i got another 1mpg and are cheap i payed 15$ at a local junk yard. as far as gearing in the axles go they came with gears as high as 3.27s but the best all around gears ive found 3.55s are perfect. i don't know how mechanically inclined you are or how far you want to dig into the truck but the second generation rangers with the 2.9s had different gearing in 1st 2nd and 3rd while retaining the same 4th and 5th gear ratios.i had swapped one into my truck and having the lower first 3 gears helped boost my city mpg.
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