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WTB Wtb: Adapter, Saginaw To Dana 20

Discussion in 'Flatfender Classifieds' started by g104x4, May 3, 2022.

  1. May 3, 2022
    g104x4

    g104x4 New Member

    Renton, WA
    Joined:
    May 3, 2022
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    Hello! I am trying to mate a GM Saginaw 4 speed (side shift) to a Dana 20 Transfer case and the adapter is no longer available as of earlier this year. Advance adapters used to make this part (P/n 50-1000).
    If you have a lead on the adapter and output shaft required, or a used assembly in good shape, please reach out! I would also be open to a Muncie to dana 20, or maybe an automatic.

    I know this was fairly common "back in the day" for flat fender jeeps that used GM drivetrain.

    This is sitting behind a Chevy 250 inline six in a 90 in wheelbase, mid engine van. If you're curious.
     
  2. May 3, 2022
    Rich M.

    Rich M. Shoe salesman 2022 Sponsor

    Maryland
    Joined:
    Mar 23, 2008
    Messages:
    1,655
    So you've got some length there, driveshaft not an issue. There is a gm factory adapter used for a few years in the early Blazers 3 speed Saginaw I don't know if the 4spd output is the same. They are a longer than the aftermarket versions. I have one but it's in MD.
     
  3. May 3, 2022
    nickmil

    nickmil In mothballs.

    Happy Valley, OR
    Joined:
    Sep 23, 2002
    Messages:
    12,119
    How much of a rush are you in? I have a complete Saginaw 4 speed in my ‘59-5 that needs rebuilt but is coming out in a couple months. Adapted to a large hole 18 and 20. Complete with shifter. Transfer case does not come with it. Last summer I sold 2 as a set, one was rebuilt. I’m just south of Portland, OR.
     
  4. May 4, 2022
    Keys5a

    Keys5a Sponsor

    Florida Keys
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    Jan 23, 2014
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    3,618
    First/second generation Handivan (pre-‘71)? I’ve seen those converted to 4WD. Those are pretty interesting when done correcly.
    -Donny
     
  5. May 4, 2022
    g104x4

    g104x4 New Member

    Renton, WA
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    May 3, 2022
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    Length is my primary issue actually. My current driveshaft is only 19" so I'm in need of the shortest option out there. Hence why I'm after CJ parts.

    Nicmil, I'm not in a hurry, if what you have is the thinner plate I'd be interested. It's nice that we're close too. I'll send you a PM
     
  6. May 4, 2022
    ITLKSEZ

    ITLKSEZ Hope for the best, prepare for the worst

    Post Falls, ID
    Joined:
    Aug 13, 2015
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    6,331
    I love that setup. The 3-ring 4-spd was the best car trans I ever ran in a jeep.
     
  7. May 4, 2022
    g104x4

    g104x4 New Member

    Renton, WA
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    May 3, 2022
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    That's good to hear! I have a three ring and a dana 20 already. Seems stout enough for my needs and compact.
     
    ITLKSEZ likes this.
  8. May 4, 2022
    nickmil

    nickmil In mothballs.

    Happy Valley, OR
    Joined:
    Sep 23, 2002
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    This is a 3 ring transmission. The transmission has bearing noise which is why it needs rebuilt. It still moves the Jeep about just fine but I'm going a different direction. This is the adapter that is about 1" or so thick. it's still in the Jeep so hard to get pics right now.
     
  9. May 4, 2022
    g104x4

    g104x4 New Member

    Renton, WA
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    May 3, 2022
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    Looks like Nickmil has what I need! Thanks guys!
     
  10. May 4, 2022
    ITLKSEZ

    ITLKSEZ Hope for the best, prepare for the worst

    Post Falls, ID
    Joined:
    Aug 13, 2015
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    6,331
    The problem I had with mine… on the AA mainshaft, the male section of the nose that the roller bearings ride on lost its hardness, and the rollers ate into the shaft. I had it repaired a few times, but it was never like new again.

    Just putting the warning out there; not sure if it was a recurring issue, or if mine was an anomaly.
     
  11. May 4, 2022
    g104x4

    g104x4 New Member

    Renton, WA
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    May 3, 2022
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    Thanks for the lookout. How did you have it repaired? Did you have the shaft sleeved?
     
  12. May 4, 2022
    ITLKSEZ

    ITLKSEZ Hope for the best, prepare for the worst

    Post Falls, ID
    Joined:
    Aug 13, 2015
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    6,331
    I’d pull it apart every few months and take it to a machine shop who would build it back up, turn it back down, and it run it for a few more months. I knew it wouldn’t last, but I was a broke college student, and that was cheaper than a new mainshaft.
     
  13. May 5, 2022
    nickmil

    nickmil In mothballs.

    Happy Valley, OR
    Joined:
    Sep 23, 2002
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    12,119
    Mainshafts can be re-tipped. They machine down the pilot, press a hardened sleeve on, then surface grind the sleeve to the original diameter. I've had it done to everything from a Saginaw, T-10, M-22, T-18, to Dana 300 inputs. Not cheap, but a viable alternative.
     
  14. May 5, 2022
    duffer

    duffer Rodent Power

    Bozeman, MT
    Joined:
    Sep 17, 2009
    Messages:
    3,637
    I'm still running the AA Muncie mainshaft I originally bought for a M20 in 1975 in the present AGE version of a wide ratio M22-almost 5 decades later. Zero problems. I would be suspect of the alignment if there was a reoccurring problem with the roller bearings.
     
  15. May 5, 2022
    nickmil

    nickmil In mothballs.

    Happy Valley, OR
    Joined:
    Sep 23, 2002
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    12,119
    That could cause a problem. Especially bellhousing to input misalignment. What I've found is usually people let the trans run low and it kills the pocket bearings between the input and mainshaft. In the case of the Dana 300 inputs they get brinelled from people not occasionally locking them into 4 wheel drive and allowing the bearings to rotate. The bearings sit in one place and eventually eat into the pilot of the input.
     
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