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Speed with an overdrive

Discussion in 'Early CJ5 and CJ6 Tech' started by RVSwisher, Jun 22, 2008.

  1. Jun 22, 2008

    RVSwisher Member

    Rochester, MN
    Jul 11, 2006
    My brother has a 64 CJ6 which is in the need of restoration that I am looking at. It has the F134 engine and a T90 transmission. If I add a overdrive, what could I expect for top speed. I would like to be able to cruise in the 60 to 65 mph range to keep up with traffic.

  2. Jun 22, 2008

    cabover Member

    Feb 2, 2008
    Check out this web site.


    on the left side of the page you will find a link that says LINK-A-PALOOZA.

    click on it and scroll to the bottom of the page.

    click on the vernco driveline calculator link

    click on the one that says ANOTHER TYPE OF DRIVELINE CALCULATOR.

    Cabover :flag:

    When building a jeep money is no object, It's an necessity.
  3. Jun 22, 2008

    timgr Jeepin' Nerd 2020 Sponsor 2019 Sponsor

    Medford Mass USA
    Aug 10, 2003
    The engine speed won't be a problem. If the engine is in good condition, there will be no danger to the engine if you can get going that fast.

    The question is whether you will have enough power to sustain that speed well enough for you to be happy with driving it on the highway. Most vehicles top speed is limited by power, not engine speed, so the aerodynamics and available power will limit you, not the gearing.

    I haven't owned one of these, but I have driven them. I'd expect you can go 65 or maybe faster with an overdrive, but maybe not uphill or into a fair headwind.
    Last edited: Jun 22, 2008
  4. Jun 24, 2008

    bkd Moderator Supreme Staff Member

    K-Town Tenn.
    Apr 29, 2007

    My 6 came w/ a f head/ T 90 and 4.27 gears, 235/75/15 tires.....it would do 65....but as Tim said not up any incline, and not into a stiff wind.
    Jim S.

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