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It's possible, but it wouldn't hold up very long. a 400 is a high torque but low horsepower motor and most tranny's wont take high torgue levels

A 400 is a high horse and torque motor, I have one in my 250. Yes its possibel, anything is possible if you have the time and money.Truthfully the fuel economy should improve if you use the overdrive. I know my uncle had a truck that was set up for overdrive and he put a 4 speed tranny in and the fue economyl was horrible. Either way let me know how it turns out, i was thinkin wether or not to put a 5 speed in mine.

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โˆ™ 2011-09-13 03:05:30
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Q: Is it possible to replace the 4-speed with a transmission with Overdrive on a 1979 Ford 400 motor?
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