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5.38 Gears

Discussion in 'Early CJ5 and CJ6 Tech' started by nrg0920, Feb 1, 2007.

  1. Feb 1, 2007
    nrg0920

    nrg0920 New Member

    Raleigh, NC
    Joined:
    Feb 1, 2007
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    38
    I first want to say that I love this site!

    I have a 1964 Jeep CJ5 with the stock gears ( 5.38 ). My top speed is about 30-35 MPH. I was wondering if anyone that with this setup, has changed the gears. I would like to get a better top end speed so I can at least drive 45 MPH comfortably; however I do not want to loose all power. I routinely take my jeep off road, and want to make sure that I still have sufficient power. I was thinking of 3.54; however I wanted to see if anyone had already done this.

    I have a completely rebuilt engine (less than 100 miles), a Weber 2 barrel carburetor, and a flame thrower high performance coil. I just would like to drive down the street without red lining the engine.

    Any help would be Great!
     
  2. Feb 1, 2007
    Sledgehammer

    Sledgehammer Sure, I'll try it

    Ellery, Il
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    Jun 7, 2006
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    343
    Welcome first off. 5.38's can be a pain. I run a T18 4spd with the 225 so I have a little more top end (60mph @ 4grand). There are plenty of people that have changed them. 3.54 would get you more top end for sure. You might regret it on low end if you do much offroad. Just my 2 cents though. Again, welcome.
     
  3. Feb 1, 2007
    neptco19

    neptco19 That guy.... Sponsor

    Athens, GA
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    Im assuming you have a F head?? If so maybe some 4.88s will get you that extra 10-15mph you need and keep your low end. If you put 3.54s in you'll never stand a chance with the 'ol Fhead trying to pull that kind of ratio..
     
  4. Feb 1, 2007
    lamar

    lamar Member

    greenville sc
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    Jan 25, 2004
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    327
    i would put an overdrive in it.herm the over drive guy sells them,also you should be able to go a little bit faster than 35 mph
     
  5. Feb 1, 2007
    trickpatrick

    trickpatrick Done? LOL

    North Idaho USA
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  6. Feb 1, 2007
    nrg0920

    nrg0920 New Member

    Raleigh, NC
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    I have a PTO Winch…would I have to get rid of the PTO to install an overdrive?

    Thanks for everyone’s help!
     
  7. Feb 1, 2007
    blevisay

    blevisay Oh Noooooooooooooooo! Staff Member Sponsor

    Portland Tn.
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    x2:beer:

    Herm is a Great guy!
     
  8. Feb 1, 2007
    nrg0920

    nrg0920 New Member

    Raleigh, NC
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    Will I run in to problems off-road, or will it struggle all the time with 3.54's?
     
  9. Feb 1, 2007
    neptco19

    neptco19 That guy.... Sponsor

    Athens, GA
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    He makes an adapter to add an OD behind a PTO, or vice versa cant remember... What engine do you have?
     
  10. Feb 1, 2007
    nrg0920

    nrg0920 New Member

    Raleigh, NC
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    134 F Head
     
  11. Feb 1, 2007
    blevisay

    blevisay Oh Noooooooooooooooo! Staff Member Sponsor

    Portland Tn.
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    No but it does get a little spendy......
     
  12. Feb 1, 2007
    neptco19

    neptco19 That guy.... Sponsor

    Athens, GA
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    Sep 26, 2003
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    Im gonna say its going to struggle alot with the 3.54s... You could get the CJs with a 4.27 ratio with the Fhead.. That would be a better comprimise to get your road speed up.
     
  13. Feb 1, 2007
    blevisay

    blevisay Oh Noooooooooooooooo! Staff Member Sponsor

    Portland Tn.
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  14. Feb 1, 2007
    nrg0920

    nrg0920 New Member

    Raleigh, NC
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    Thanks!
     
  15. Feb 1, 2007
    windyhill

    windyhill Sponsor Sponsor

    PA
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    I love my 5:38's You can't really go to slow in a jeep:) 5:38's with an overdrive is the slick ticket, and you'll probably pay about the same for new gear sets seals bearings etc. or close anyway.
     
  16. Feb 1, 2007
    lamar

    lamar Member

    greenville sc
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    pto hooks up behind the overdrive
     
  17. Feb 1, 2007
    nrg0920

    nrg0920 New Member

    Raleigh, NC
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    What overdrive do you have? What is your top speed?
     
  18. Feb 1, 2007
    nrg0920

    nrg0920 New Member

    Raleigh, NC
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    Do you have this setup? Did you install it yourself?

    Thanks!
     
  19. Feb 1, 2007
    Jeeper Preacher

    Jeeper Preacher My Little Grill Girls

    Wilmington, NC
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    Feb 18, 2006
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    Nick: Hey, another Raleigh Jeeper...great! Listen, introduce yourself in the Intro section so we can hear more about your Jeep and its history. Love the avatar picture, got more pictures? I am strongly considering white with black windshield myself since that was the original paint.

    On the gearing...yes, the OD is the best bet!
     
  20. Feb 1, 2007
    w3srl

    w3srl Jeepless in Pittsburgh Staff Member Sponsor

    Pittsburgh, PA
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    You should be able to get more than 35 MPH out of an F-head with 5.38's. Something just doesn't sound right about that...
     

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