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Jeep Th400 And Dana 20

Discussion in 'Early Jeep Restoration and Research' started by jbjeeps, Apr 7, 2022.

  1. Apr 7, 2022
    jbjeeps

    jbjeeps Member 2022 Sponsor

    The Idaho side...
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    I brought these home yesterday. I was told they came off a 350 Buick engine out of a 1970 Jeep Wagoneer. I found that the number 300596 on the Dana 20 tag indicates that it is a Jeep transfer case. Don't know what the other numbers are, maybe part number? The transmission and transfer case both turn freely and the transfer case shifts into all positions, 2H, 4H, N, 4L. Didn't get a flex plate or torque converter.
    [​IMG]

    [​IMG]
     
    Last edited: Apr 7, 2022
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  2. Apr 8, 2022
    jpflat2a

    jpflat2a what's that noise?

    Riverside CA
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    The Jeep number on that tag is the other number: 994537 FYI
     
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  3. Apr 8, 2022
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Medford Mass USA
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    You should try to get the adapter ring, convertor and flex plate. Jeep used the Buick Nailhead type case and adapted to their commodity engines with a unique adapter, convertor and flex plate. Unlikely you will find those part on their own. It's an oddball. Not much value in the transmission without them.

    The adapter between the transmission and transfer case is worth something. Mix it with a Chevy or BOP case TH400 and you can run lots of different engines.

    Yes, 994537 is a typical Jeep Corp PN from 1970. I'm sure it's in the J-series parts book on the Tom Collins site. Group 18 IIRC.
     
    Last edited: Apr 8, 2022
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  4. Apr 8, 2022
    jackdog

    jackdog Member 2021 Sponsor 2020 Sponsor

    Finger Lakes NY
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    I have the adapter can post a pic if it helps.
     
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  5. Apr 9, 2022
    jbjeeps

    jbjeeps Member 2022 Sponsor

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    Good to know, thanks. I was thinking I might put this behind a Dauntless 225, but it sounds like that won't work without those parts. Jack

    Update: I just spoke with the person I got the trans and transfer from, he says he has those parts. I'll post pictures when I get them. Jack
     
    Last edited: Apr 9, 2022
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  6. Apr 9, 2022
    jbjeeps

    jbjeeps Member 2022 Sponsor

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    That would be great, thanks. Jack
     
  7. Apr 9, 2022
    jackdog

    jackdog Member 2021 Sponsor 2020 Sponsor

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  8. Apr 9, 2022
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor 2021 Sponsor 2020 Sponsor

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    Note that the '62-73 J-series parts book is online at the Tom Collins site https://oljeep.com/edge_parts_man.html You can find drawing below and the parts listings for it there.

    The earliest Wagoneers got the Borg-Warner automatic (like a Ford FMX) and the Dana 21 (?) single-speed transfer case. After 1965 through 1979, Jeep used the same automatic transmission for all vehicles, the GM TH400. Initially these all had the nailhead case, but starting in about 1974, GM provided TH400s that bolted directly to the AMC engines, with no adapter. The shorter nailhead case leaves room for ring-shaped adapter between the engine and transmission. Jeep manufactured a specific adapter for each engine they offered in this era; 225, 232, 258, 304, 327, 350, 360.


    TH400adapter.png

    Note that this is shown in the illustration for Group 1 (engine) but the parts are listed in Group 6 (transmission). I presume the 225 adapter parts are the same as the 350 adapter parts. The 225 will have its own flex plate. Some of these applications use the crank end adapter 6.521-1 but the 350 (and 225?) and early 232 did not.
     
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  9. Apr 10, 2022
    jbjeeps

    jbjeeps Member 2022 Sponsor

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    Thanks for posting this info. Jack
     
  10. Apr 19, 2022
    jbjeeps

    jbjeeps Member 2022 Sponsor

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    I got these the other day. They all came off the Buick 350 in the 1970 Jeep Wagoneer that the transmission and transfer came from. Will this adapter ring work on the 225?

    I have a lead on an adapter and flex plate from a 225, waiting to see if that pans out.
    [​IMG]
     
    Last edited: Apr 19, 2022
  11. Apr 20, 2022
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor 2021 Sponsor 2020 Sponsor

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    The adapter should be the same for the 225. If someone can tell you the factory PNs from a Jeepster parts book, you can match them to the J-series book on the Tom Collins site. Might still be ok, even if they don't match - insignificant differences will spawn a new part number. The flex plate is balanced for the 350, not the OF 225. Don't know about the convertor - probably. There are businesses that rebuild them - might be a good core. They tend to fill with sediment from the plates etc. wearing.
     
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  12. Apr 20, 2022
    jbjeeps

    jbjeeps Member 2022 Sponsor

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    Thanks Tim, appreciate that information. I'm still waiting to see if I can get the 225 flex plate I heard about.
     
  13. Apr 27, 2022
    jbjeeps

    jbjeeps Member 2022 Sponsor

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    I picked up the adapter and flex plate on the left today. They came out of a '69 or '70 Commando with a Dauntless 225 V-6. The two items on the right are the ones I got out of the 1970 Jeep Wagoneer with a 350 Buick. I know that in the picture the 225 flex plate appears to be out of round at the bottom left, but that's just a distortion in the picture. It's actually perfectly flat and round.

    The green paint on the 225 flex plate looks like the same color that was used on the 225 engine.


    [​IMG]
     
    Last edited: Apr 27, 2022
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  14. Apr 27, 2022
    jbjeeps

    jbjeeps Member 2022 Sponsor

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    Question: is it possible to have the 350 flex plate rebalanced to work on the 225? If so, anyone know where to get the done?
     
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