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SM 420 2wd and 4wd version?

Discussion in 'The Garage' started by tellmehow, Jul 11, 2004.

  1. tellmehow

    tellmehow Newbie

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    Hey guys! Anyone know if the SM420 off a 1966 2 wheel drive 3/4 ton truck will work for my 4x4 blazer? Some guy wants $100 for the trans with bellhousing & I'm not sure if this trans is what I need /forums/images/graemlins/confused.gif Thanks
    Frank
     
  2. m j

    m j 1/2 ton status

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    go price the required adapters
     
  3. tellmehow

    tellmehow Newbie

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    do you know what company makes the adaptors?
     
  4. m j

    m j 1/2 ton status

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    Advance Adapters
    Novak
    the bottom line is that it isnt worth it when a $50 sm465 bolts up
     
  5. GMCLegacy

    GMCLegacy 1/2 ton status

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    also the ball stud that the H Bar for the clutch linkage was placed on the engine blocks back then, where as a 465's is on the bellhousing.

    id like to have a SM420 for its shift pattern, but the no sych 1 and 2 is a downfall.
     
  6. u2slow

    u2slow 1/2 ton status

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    [ QUOTE ]
    also the ball stud that the H Bar for the clutch linkage was placed on the engine blocks back then, where as a 465's is on the bellhousing.

    id like to have a SM420 for its shift pattern, but the no sych 1 and 2 is a downfall.

    [/ QUOTE ]

    Ballstud location is year specific. Split is 72/73.

    SM420 is syncro 2nd... except when it's worn out. /forums/images/graemlins/grin.gif

    EDIT: Only married t-case adapter is for the SM420 is a Rockwell T221. ('67 only)
     
  7. GMCLegacy

    GMCLegacy 1/2 ton status

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    hmmm, learn something new everyday.

    so there are 465 bellhousings without a ball stud for the h-bar? is that an aluminum or cast iron bellhousing for those goofed up years?
     
  8. u2slow

    u2slow 1/2 ton status

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    68-72 use block-mount ballstud and cast bellhousing with correct index for SM465.
     

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