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3.73 vs 3.54

Discussion in 'Jeepster Commando and Commando Tech' started by jackdog, Apr 13, 2016.

  1. Apr 13, 2016
    jackdog

    jackdog Member

    Finger Lakes NY
    Joined:
    Jul 16, 2013
    Messages:
    526
    Found a set of set of axles for my build that are 3.54 that I would like to update with, my stock ones are 3.73. I will be running the 225, T14 and D20. Will this be a big difference?
     
  2. Apr 13, 2016
    Daryl

    Daryl Sponsor

    Bonney Lake, WA
    Joined:
    May 25, 2006
    Messages:
    2,871
    Pretty easy to start burning up clutches when you get that high. Even if you are running really short tires, it would be less then optimal. I think of 3.73s as the bare minimum for a 3 speed transmission. On the other hand you can cruise down the highway at 80 mph just above an idle.
     
  3. Apr 13, 2016
    uncamonkey

    uncamonkey Member

    Greeley CO
    Joined:
    Jun 2, 2009
    Messages:
    2,104
    Where are you taking this, on road only or mild off road? What's in your mind?
     
  4. Apr 13, 2016
    Jeepenstein

    Jeepenstein Me like Jeep..

    North Central FL
    Joined:
    Jun 15, 2003
    Messages:
    2,132
    3.55 is doable, but yeah keep your tires under 31" for sure..
     
  5. Apr 14, 2016
    jackdog

    jackdog Member

    Finger Lakes NY
    Joined:
    Jul 16, 2013
    Messages:
    526
    Mostly highway and an occasional trail ride.
     
  6. Apr 14, 2016
    OrangeCJ5

    OrangeCJ5 Sponsor

    Taylorsville, UT
    Joined:
    Apr 29, 2003
    Messages:
    422
    Are your stock gears in OK condition? You can always swap the 3.73's over to the new axles.
     
  7. Apr 14, 2016
    oldtime

    oldtime oldtime

    St. Charles,...
    Joined:
    Aug 14, 2006
    Messages:
    3,466
    3.54 was the standard CJ ratio after 1975.
    That's 46 / 1
    3.54 is only a 5% increase over 3.73 gears.
    Instead of cruising say at 60 mph it will cruise at 63 mph.
    But I agree 3.73 is a better FDR for the Dauntless power band unless most time is spent on the hiway.
     
  8. Apr 14, 2016
    uncamonkey

    uncamonkey Member

    Greeley CO
    Joined:
    Jun 2, 2009
    Messages:
    2,104
    My opinion is that it isn't worth the effort to swap them for the minimal gain you would get out of it. My Commando has 3.37's in it and I wish it had the 4.27 gears.
     
  9. Aug 29, 2016
    commanlerwrangdo

    commanlerwrangdo Member

    Cleveland, Ohio
    Joined:
    Feb 10, 2014
    Messages:
    470
    I have to wonder if my 68 has the 3.37's or the 3.54's in it. I can hit 80MPH on the highway and the Dauntless just hums along. Love to put a tach on it someday so I can see the RPM'S. My speedometer starts at 30 degrees below 0 MPH, so at 80 MPH, I'm just touching the 5 on 50. Odometer seems darn close, I get 9.7 tenths between two highway milepost markers, probably due to the 30.5 inch tires I gather.....:whistle:
     
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