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another sm420 question

Discussion in '40- & 55-Series Tech' started by plan66, Jul 13, 2003.

  1. plan66

    plan66

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    I'm looking at two sm420's in a local wrecking yard. One is from a 1 ton, the other from a 2 or 2.5 ton.

    Anyway, I looked at Pinhead's writeup and a couple others, but I see the two sm420's I'm looking at have a different casting by the reverse gear bulge. These ones have two horizontal ribs, one above, the other bellow the filler plug. Otherwise the trannys look the same. Oh, both have a parking brake drum. One is L213, (Dec 21 63 ?), the 2ton is K85 (Nov 8, 65 ?).

    Will the lower rib interfere with the transfercase output if I use a plate adapter? It looks like it 'should' clear, but its hard to tell. Anyone use this setup?

    Thanks
    Martin
     
  2. Chef

    Chef

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    Later 420's had the reinforcement ribs. They don't interfere any more than the first/reverse gear hump...
     
  3. Cruzilla

    Cruzilla

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    If you are using the one inch plate you will have to grind off the rib and grind down the yoke/U-joint down to the lock washers