Need help choosing a trans for my swap

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  1. #1

    Default Need help choosing a trans for my swap

    Hey guys,

    I'm currently in the process of doing a 5.4 swap (Ford Lightning Engine) for my Foxbody. The reason I'm doing this swap is because I have a mechanic shop that mainly works on Ford Lightnings so we have an engine ready to go and the 1984 5.0 won't hold up the power I want to make and there seems to be alot of power loss on launch. I'm trying to decide what transmission to use for this swap. I've been researching and my possibilities right now are (take into mind that all of these will be reinforced to make sure it can handle the power) 4R70W, 4R75W, TH400, and the 6R80. I was going to pull the trigger on the TH400 but the lack of overdrive causes a concern as I would not only be doing drag racing but highway use/pulls very constantly. I want to be able to drive the car on the streets/freeway and occasional strip use. The 6R80 seems to be out of the picture because there is too many electronics that cost too much to install in the car. Give me some advice on what transmission I should go with, if you have any other options let me know of them too! I'm looking to make around 650 horsepower at least as soon as the swap is done.

    P.S.: I will also be posting a build thread to show progress.

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  3. #2


    If you want a simple strong drag race unit choose a TH400 with an ATI or Reid case. The TH400 transmissions are pretty much as good as it gets.

    If you need the overdrive option, you will want the 4LE80 transmission which is essentially a TH400 with an OD. There are many good transmission shops out there. If I were buying one of these units I would go to Hughes (<=clickable). Be sure to get the ATI or Reid case.


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