SM 420 problem

Discussion in '1955-1959' started by GFROMFRANCE, Jan 22, 2014.

  1. GFROMFRANCE

    GFROMFRANCE Member

    Joined:
    Jul 2, 2011
    Messages:
    22
    Location:
    le thor ,france
    Today 01:02 AM
    GFROMFRANCE
    First drive yesteday for my '59 apache since november 2011, with my old transmission rebuild (thank a lot Mr keisler).
    After fews kilometers ,the third speed jump with gear noise!
    Is that some one has already had this problem?
     
  2. vwnate1

    vwnate1 Member

    Joined:
    Jan 1, 2000
    Messages:
    11,673
    Location:
    AMERICA !
    Tranny Woes

    ?? It was fine and then began to make noise and pop out of gear ? .

    Did you remember to fill it fully with 85W ~ gear oil ? .

    Does it pop out and make noise under acceleration or on coast ? .

    What typ of noise , whining , growling or chattering , crashing ? .

    Did you remember to put a 1/2" NPT magnetic drain plug in it ? .

    I'd right away drain the oil into a Hospital Clean pan then strain it through some clean white cloth to see what's in there .

    Does it still shift O.K. ? .

    NOVAK sells SM420 parts and service books , you can overhaul it easily in your driveway , no special tools necessary .

    Keep us posted please .
     
  3. GFROMFRANCE

    GFROMFRANCE Member

    Joined:
    Jul 2, 2011
    Messages:
    22
    Location:
    le thor ,france
    Yes the shifter pop up in acceleration with a crashing noise. maybe the gear oil is not the rigt one, but there's only the third ,who pop up.
    i will change the gear oil.

    gerard
     
    Last edited: Jan 23, 2014

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