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Sm 420

Discussion in 'The Garage' started by Brocky, Sep 26, 2005.

  1. Brocky

    Brocky 1/2 ton status

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    I just found one of these old dinosaurs. Now I am going with the 465 in mine but is the sm 420 any good. Is anyone running one?
     
  2. Robert79K5

    Robert79K5 1/2 ton status

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  3. wasted wages

    wasted wages 3/4 ton status

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    I think they have a lower first gear than the 465,,, :bow:
    Correct me if I'm wrong,,,
     
  4. zero cool

    zero cool 1/2 ton status

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    Yup. The SM420 has a 7.05:1 low gear. The SM465 only has a 6.56:1.
     
  5. Brocky

    Brocky 1/2 ton status

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    Sweat my father took it out of an Chevy years ago. I can remember playing with it as a kid. Shifting gears. We threw it in an old basement of an old house. The house is long since gone but the complete tranny is sitting there. I was looking for a shifter and taught about it. I am gonna haul it home in a few days. My buddy said the same tranny was in his Fathers dump truck, so I said it must be a good low gear. A little research and it says 7.05:1, Sweat
     
  6. diesel4me

    diesel4me 1 ton status Premium Member

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    didn't grab one!..

    I was probably foolish not to grab one of theese tranny's when the junkyard closed I worked at this year..there were several GM school busses from 1956-1965 there with them --a few of the busses had 5 speed Clark trannys too--I passed on them because of the driveshaft mounted "E" brake assembly--something that I wasnt't sure would be desireable,or whether they could be coupled to a 4x4 transfer case,being 2wd.. :confused: ...oh well--they are history now.. :doah: :(
     

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