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aero is right that modern fans are much more advanced than an all metal non clutching fan on pre 1980s vehicles. However the quicker warmup time and still less drag from no fan at all will boost the mileage. I used 3.8 ford taurus fans on several small trucks. They move a lot of air and are very affordable at the local pullyard. The taurus fan is the same fan used on the v8 mustang and the larger cars. Temperature senders/switches are an easy find as well. If you are always over 20mph and are not running the a/c, your e-fan will never come on at all. If you do not want to put used "junk" on your newer truck i would take a look at summit, as they have nice stuff.
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