Hydromatic Differences Jet vs. Stepdown

hudsonguy
hudsonguy Senior Contributor
edited November -1 in HUDSON
Is the Jet Hydromatic transmission different from the Hydromatic that was installed in the stepdowns? I assume it is, but thought I'd ask someone who knows for sure. Thanks for the help. Doug

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  • 53jetman
    53jetman Senior Contributor
    hudsonguy wrote:
    Is the Jet Hydromatic transmission different from the Hydromatic that was installed in the stepdowns? I assume it is, but thought I'd ask someone who knows for sure. Thanks for the help. Doug



    I'm sure it is different. Model # used on the Jet was J-52, and the models used on the bigger Hudson engines were designated H-50, H-51, H-52, etc. The Jet 202 engine was a bit short on the torque of the larger Hudson engines, and probably would not have performed properly with the same Hydro unit. It did, however, perform very well with the J-52 Hydro. The 202 engine handled the Hydro much better than the '55 Rambler engine did.



    Jerry

    53jetman
  • hudsonguy
    hudsonguy Senior Contributor
    Jerry,



    I kind of figured as much.



    Thanks,

    Doug
  • Unknown
    Unknown
    haven't looked into it,but generally,smaller cars with less torque would have fewer clutch plates inside,also the torus coupling would be smaller diameter,and the valve body would probably shift at a different rate.

    I know this is how they were built for Rambler,Nash etc. so I assume the same for Jet.

    I can check part numbers if needed.
  • super-six
    super-six Expert Adviser
    yorgatron wrote:
    haven't looked into it,but generally,smaller cars with less torque would have fewer clutch plates inside,also the torus coupling would be smaller diameter,and the valve body would probably shift at a different rate.

    I know this is how they were built for Rambler,Nash etc. so I assume the same for Jet.

    I can check part numbers if needed.



    Although I've never had one apart, I've heard this to be correct.
  • Unknown
    Unknown
    It has one less clutch in both the front and rear drum. I believe that the difference was in the thickness of the clutch piston. Torus coupling is smaller, some used a large O- ring instead of a gasket. Lou Cote
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