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transmission options for flatheads in trucks?

Discussion in 'The Antiquated' started by Duellym, Jul 8, 2021.

  1. Duellym
    Joined: Feb 28, 2016
    Posts: 307

    Duellym
    ALLIANCE MEMBER

    Hi all, I'm wondering if any of you have any experience running any other transmissions behind flatheads besides the stock 3 speed and t5's? I have one of the big truck 4 speeds currently mocked up in my 47 1/2 ton truck however its not exactly in what I would call good shape, instead of trying to rebuild it I'd rather get a different transmission that's at least synconized and has a little better gear ratios for me to drive it. I'm not exactly keen on the idea of a s10 t5 either because of how much they're going for considering what they are and they won't give me the gear ratios I want either. I wanna be able to use the truck as a truck, so I keep looking at 4 speeds out of much newer trucks, i just don't know what ones I could actually use. I'm sure I am not the 1st person to do something like this so maybe one of you on here has. Thanks.
     
  2. rusty valley
    Joined: Oct 25, 2014
    Posts: 2,814

    rusty valley
    Member

    Some folks unbolt the front section of your 4 spd, the "hogs head " and use that to mount what ever you want ...with some "figgerin"
     
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  3. choppedtudor
    Joined: Nov 28, 2009
    Posts: 684

    choppedtudor
    Member

    I'm running a 700r4 behind my flathead. I like the low 1st gear and the overdrive. Anything is possible.
     
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  4. 1952henry
    Joined: Jan 8, 2006
    Posts: 892

    1952henry
    Member

    A T98 Warner is synchronized, but needs to be from 48-52. It is a modernized version of the T9 non-synchro you most likely have now.
     
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  5. The T98 is hell for stout...used in 1 1/2-2 ton trucks 48-52 as said. It's also big, and very heavy, It does bolt up to a flatty though. Getting hard to find around here, most of those big trucks have gotten scrapped.
    A better option might be a the 80's F150 trans (T170?....not sure of the ID#). Look on the Fordbarn for more info.
     
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  6. Duellym
    Joined: Feb 28, 2016
    Posts: 307

    Duellym
    ALLIANCE MEMBER

    I was looking at the t19 that was in bullnose f150s/250s the only issue i can find is I can't find definite info on what the input shaft length is.
     

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