Interest in Hydramatic-to-TH400 adapter?

GrimGreaser
GrimGreaser Senior Contributor
in HUDSON

Current shenanigans involve developing a conversion for those with a hydramatic to use the hydro (modified) bellhousing with an adapter plate and a modified torus/flexplate to run a TH400 transmission. TH400 has to have the bell cut-off and the hydro bell needs machining at both ends, nothing crazy. Flexplate adapter is still in the works at the moment. I'll upload pics when I get a chance.

Thanks!

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  • 50C8DAN
    50C8DAN Senior Contributor
    edited April 27

    I think Dany Spring has what you need.

  • 50C8DAN
    50C8DAN Senior Contributor

    There was also this post from a few years ago;


    https://openforum.hetclub.org/discussion/346659/adapt-chevy-transmission-onto-hudson-motor

  • GrimGreaser
    GrimGreaser Senior Contributor
    edited April 27

    Thanks Dan, as far as I know this is different than any other adapter I'm aware of. Props to to whomever modded the TH400 I have now, I'm just trying to improve and maybe provide those with the means a decent transmission adapter kit. It's probably 6-to1, half-dozen-the-other as far as adapters go. But this doesn't need a big thick adapter plate between the transmission and engine. I can make no price comparisons now though. Stock starter position and starter is a plus, most likely.

  • 54coupe
    54coupe Member
    edited April 27

    Once upon a time, Randy Maas did them this way.

  • GrimGreaser
    GrimGreaser Senior Contributor
    20260427_080528.jpg
    20260427_080548.jpg


  • GrimGreaser
    GrimGreaser Senior Contributor
    edited 2:01AM
    20260318_160827.jpg
    20260325_162021.jpg

    Currently, this requires 3 custom parts. Adapter plate between trans and bell housing, a custom flexplate and crank adapter. It requires machining to the bellhousing and cutting the gear ring off of the torus plate. The flexplate/torus plate mods are currently in the works... Just modding the torus will make the torque converter-to-crank connection too rigid without significant work. Lots of stress on the transmission pump with just a bit of misalignment.

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