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Hydromatic Differences Jet vs. Stepdown
  • hudsonguyhudsonguy
    Posts: 754Platinum Member
    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
  • 53jetman53jetman
    Posts: 881Platinum Member
    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
    Jerry
    email: HudsonJetman@mail.com
    2nd Generation Hud-Nut
    HET Tech Adviser on Hudson Jets 1953 & 1954
    HET Registrar of all Hudson Jets
  • hudsonguyhudsonguy
    Posts: 754Platinum Member
    Jerry,



    I kind of figured as much.



    Thanks,

    Doug
  • Posts: 0
    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-sixsuper-six
    Posts: 214Gold Member
    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.
    PhotobucketLarry
  • dynolou2
    Posts: 164Gold Member
    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