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Technical Manual Transmission Flushing / Cleaning

Discussion in 'The Hokey Ass Message Board' started by HuskerNation, May 31, 2020.

  1. HuskerNation
    Joined: Dec 28, 2010
    Posts: 229

    HuskerNation
    Member
    from Montana

    I pulled the plug on my stock 1937 Hudson transmission & initially it appeared pretty clean but then upon closer inspection I saw it wasn’t. So I’m wondering if anyone has a recommendation for flushing / cleaning out the trans before I put new gear oil back in her. So far she’s sat overnight with plugs out. Below are photo of drain pan from trans & the paper towel used to clean out the concave area of the two plugs:

    Adjustments.JPG

    IMG_1517.JPG





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  2. hemihotrod66
    Joined: May 5, 2019
    Posts: 175

    hemihotrod66
    Member

    I don't know what year they stopped using a wet clutch in Hudsons....The clutch used a fluid called Hudsonite oil....Just some info for you....
     
  3. VANDENPLAS
    Joined: Dec 14, 2009
    Posts: 2,371

    VANDENPLAS
    Member

    Someone else might chime in.

    what I’ve done in the past with dirty manual transmissions , diffs and transfer cases is just multiple oil changes to flush out sludge n gunk.

    mid everything else is working fine just change the fluid a few times.
    Find out what your unit takes IF it does take a unique fluid/ oil
     
  4. dirty old man
    Joined: Feb 2, 2008
    Posts: 8,540

    dirty old man
    ALLIANCE MEMBER

    The Hudson clutch is what used the special fluid. I'm not sure, but I think the actual trans used a normal gear lube. I remember the clutch fluid came in a small, maybe 4-5 oz., can and all I ever saw was in the Permatex brand.
     
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  5. HuskerNation
    Joined: Dec 28, 2010
    Posts: 229

    HuskerNation
    Member
    from Montana

    The clutch is a completely different bird & indeed uses “Hudsonite” oil in the actual clutch unit. A few guys sell it that I know of but I’m working on the actual transmission, not the clutch. Most use a 75w-90 & must be “yellow metal safe” (brass, bronze, copper) so typical guys stay with GL4 just to be safe. I have seen a few GL5 gear oils that state they are yellow metal safe, like Royal Purple Max Gear.



    I actually have a couple of the old Permatex clutch fluid for the Hudson!

    IMG_0760.JPG


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  6. Jmountainjr
    Joined: Dec 29, 2006
    Posts: 1,103

    Jmountainjr
    ALLIANCE MEMBER

    If the trans uses a heavy weight gear oil I have used some diesel or kero as a flush.
     
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  7. squirrel
    Joined: Sep 23, 2004
    Posts: 46,101

    squirrel
    Member

    Keep in mind that a flush will flush the crap into places that you might not want it to go. I would take the trans out, take it all apart, clean, inspect, reassemble with new gaskets, and add new GL5 oil because they have it at walmart.

    But I've been known to do stupid things, involving driving old cars.
     
  8. HuskerNation
    Joined: Dec 28, 2010
    Posts: 229

    HuskerNation
    Member
    from Montana

    I opted to just toss in some Wally World gear oil I had & then run her since she’s up on jack stands. Got her plenty warm then drained her right after I shut her off. Color looked good so I’ll just add the gear oil I bought for her & go with it that way. If I do a clutch down the road I’ll pull the trans & can go through her then. Thank guys!


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  9. Wrench97
    Joined: Jan 29, 2020
    Posts: 62

    Wrench97

    Epoxy a magnate to the top of the drain plug.
     
  10. 51504bat
    Joined: May 22, 2010
    Posts: 1,834

    51504bat
    ALLIANCE MEMBER

    In the old 4 speed crash box in a '40 1 1/2 ton Ford I had I flushed it with diesel. Sold the truck a year or so after that so I can't say what the long lasting result was.
     
  11. lostone
    Joined: Oct 13, 2013
    Posts: 1,202

    lostone
    Member
    from kansas

    Flushed with diesel too. Then a wand air blower in the hole blowing around then another flush with diesel and then oil and done.
     
  12. Ebbsspeed
    Joined: Nov 11, 2005
    Posts: 5,034

    Ebbsspeed
    ALLIANCE MEMBER

    This would be cruel and unusual punishment, not to mention you'd likely never be able to re-install the drain plug.
     
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  13. Wrench97
    Joined: Jan 29, 2020
    Posts: 62

    Wrench97

    Done it quite a few times on older trans.
     
  14. Ebbsspeed
    Joined: Nov 11, 2005
    Posts: 5,034

    Ebbsspeed
    ALLIANCE MEMBER

    Uhh, I was taking advantage of your mis-spelling of the word.
    mag·nate
    /ˈmaɡˌnāt,ˈmaɡnət/
    noun
    1.
    a wealthy and influential person, especially in business.

    I usually epoxy or JB Weld a magnet in the drain plug on any vehicle I have.
     
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  15. nrgwizard
    Joined: Aug 18, 2006
    Posts: 1,166

    nrgwizard
    Member
    from Minn. uSA

    Yah, I caught that right away. Funny... :D .
    Marcus...
     

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