SM420 Trans U-Joint Question

Discussion in '1947-1954' started by DougT, Jul 25, 2019.

  1. DougT

    DougT Member

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    Jul 25, 2019
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    I'm working on an SM420 with the enclosed u-joint. From what I've gathered in searches, these were used in 47-51 1/2 and 3/4 ton trucks. I can find a joint listing for the 1/2 ton but doesn't say anything about the 3/4. Are they the same? If they aren't the same, does anyone have the dimensions so I can tell what I have?
     
  2. Bill Hanlon

    Bill Hanlon Member

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    Klein TX
    For GMC (and I assume Chevys are the same) 1/2 ton part numbers are different than 3/4 ton.
     
  3. vwnate1

    vwnate1 Member

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    Dim memories here, there are different P/N's fpr 1/2 ~ 3/4 ton but maybe interchangeable.......

    "Mothertrucker" in Az. will know and have them for sale......
     
  4. sleepindawg

    sleepindawg Member

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    Jun 14, 2010
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    Location:
    Topeka, Ks
    They are interchangeable on the trans, but NOT on the driveline.
     

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