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Sm420

Discussion in 'Intermediate CJ-5/6/7/8' started by Kingaircj, Jul 30, 2009.

  1. Jul 30, 2009
    Kingaircj

    Kingaircj Member

    Duncan Oklahoma
    Joined:
    Jul 4, 2008
    Messages:
    83
    Lucky me I was just given a SM420 with Dana 18/20 adpater already on it:beer: I have read the novak installing sm420 in to a jeep (73 cj5). I will need to pick up the bell housing, and clutch fork.

    My question is: If I can use the flywheel that is already on my 304 then why do I have to use the smalller clutch plate and diaphragm?
     
    Kingaircj, Jul 30, 2009
    #1
  2. Jul 30, 2009
    Michaelo

    Michaelo Member

    Neodesha, Kansas
    Joined:
    Sep 21, 2002
    Messages:
    90
    I think it has to do with with the shape/design of the other bellhousing. I'm not positive though
    Posted via Mobile Device
     
    Michaelo, Jul 30, 2009
    #2
  3. Jul 30, 2009
    kirk505

    kirk505 Member

    SAN DIEGO COUNTY
    Joined:
    Jun 7, 2009
    Messages:
    173
    The fork may be hard to find. I found a bellhousing at a local wrecking yard.
     
    kirk505, Jul 30, 2009
    #3
  4. Sep 1, 2009
    Kingaircj

    Kingaircj Member

    Duncan Oklahoma
    Joined:
    Jul 4, 2008
    Messages:
    83
    Got all the adapters, bellhousing, and fork. However my new question is: Do I need to get new driveshafts?
     
    Kingaircj, Sep 1, 2009
    #4
  5. Sep 1, 2009
    DrDanteIII

    DrDanteIII Master Procrastinator

    Milford NJ 08848
    Joined:
    Mar 21, 2007
    Messages:
    1,519
    I would bet that you definitely do. But you wont know what lengths you need untill the drivetrain is in place.
     
    DrDanteIII, Sep 1, 2009
    #5
  6. Sep 1, 2009
    Bob Greenslade

    Bob Greenslade Member

    Roseville CA
    Joined:
    Sep 15, 2008
    Messages:
    232
    You need to run a large and strong a clutch as you can fit in the bellhousing. A small clutch may not handle the power of the 304. I'm running a small clutch, it was one I had laying around, and with a 360 it will break loose on the highway in 4th gear if I gas it. I'm going to change it out this winter to a 11" for a J truck.
     
    Bob Greenslade, Sep 1, 2009
    #6
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