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make my '74 jeep more of a fuel miser-thoughts?

Discussion in 'Intermediate CJ-5/6/7/8' started by joe28, Feb 4, 2011.

  1. Feb 8, 2011
    DrDanteIII

    DrDanteIII Master Procrastinator

    Milford NJ 08848
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    That's what I was thinking. maybe on a 6cyl setting which would give 1.33x

    So if the motor was actually running 3k RPM@ 65 it would read 4000rpm (give or take.)
     
  2. Feb 8, 2011
    73cj5

    73cj5 Member

    Maine
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    Jan 15, 2004
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    Exactly...
    1.5x actual error, 3 ignition pulses per rev / 2 pulses per rev for 4 cyl tach = 1.5X actual rpm


    3000rpm actual = 4500rpm indicated
    2500rpm actual = 3750rpm indicated

    Thats right in the range for 3.73 gears.
     
  3. Feb 10, 2011
    iagmc

    iagmc Member

    SE Iowa
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    I had a similar issue with my 304 come to find out I got it stuck in 2L with a d20, some says it is not possible, but it was. I was turning about 5K at 55 MPH, now in 2 H its about 2500 at 55.
     
  4. Feb 10, 2011
    0IIII0

    0IIII0 Nibblin' on sponge cake..

    Tempe, Arizona
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    Getting stuck in 2L is common on old D20's. I had a similar problem before I rebuilt mine.
     
  5. Feb 11, 2011
    OleBlue

    OleBlue Sponsor

    Tennessee
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    Pardon my transfer case ignorance, but how can you get stuck in 2L when that's not an option in the 4H/N/2H/4L shift pattern?
    Posted via Mobile Device
     
  6. Feb 11, 2011
    Rick

    Rick Member

    Hanson,Ma.
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    Oct 19, 2006
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    Worn transfer case shift linkage. Had it anytime I wanted it in my 73 before I replaced all the worn shifter parts. Never had it stuck there, but I could select it by positioning the throw just right. Some people find it useful and even install twin stick shifters on the transfer case to be able to access it when they want.
     
    Last edited: Feb 11, 2011
  7. Feb 11, 2011
    DrDanteIII

    DrDanteIII Master Procrastinator

    Milford NJ 08848
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    4H/N/2H/4L
    ..........^
    your shift rails get stuck between theses two.
     
  8. Jan 15, 2022
    Allan

    Allan 74 Renegade

    Olympia
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    In
    Hello, I think I have the same issue, how do I get it unstuck. I thought it was in 2hi but it is pushing 3000RPMs at 40 MPH. Just completed the rebuild. 304 T-15 to Dana 20/Dana 44.
     
  9. Jan 15, 2022
    Jw60

    Jw60 Sitting up n buckled down. 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Sedalia MO.
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    Clean the linkage up really well and saturate with wd40 then a penitrating lubricant. Then Try hitting a rubber mallet conservativly on the shift rods as they enter the transfercase. Be careful to hit them parallel to the shift rod so you don't risk bending them as that will make it easier to get stuck.

    It's possible moisture froze up in there on the rails or shifter.

    Twin stick is a permanent solution but not necessarily needed unless something is wrong.
     
    Allan likes this.
  10. Jan 15, 2022
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
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    This is a decade-old thread - maybe you should post something new?

    The 2L position is there on a Dana 20 shifter, it's just not labeled. If you push all the forward, then back one, you will be in 2HI. 4HI and 2HI will give you the same forward speed. To go into 2LO or 4LO you must go through neutral, so it's not a change you'll make accidentally. Plus the change to low range will make gear clash if you try it while you are moving at more than a crawl.

    With the hubs locked in you can go into 4HI from 2HI at any speed, so lock in the hubs and push the shifter all the way forward. Use your foot if you have to. Moving forward and straight ahead at low speed there should be little resistance to that, but an obvious notch. 4HI will be way forward, well beyond vertical. Then try to move one notch back at a reasonable speed, say 20MPH. That should be 2HI. Another notch back is neutral, and that's obvious from the throttle.
     
    jeepstar, Lockman, Jw60 and 2 others like this.
  11. Jan 15, 2022
    Allan

    Allan 74 Renegade

    Olympia
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  12. Jan 15, 2022
    Allan

    Allan 74 Renegade

    Olympia
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    I will try the process and let you know if it works. Thank you
     
  13. Jan 15, 2022
    Allan

    Allan 74 Renegade

    Olympia
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    Just tried that, I have two gears forward of neutral. still stuck. If I have two gears forward of neutral and 4L is behind neutral can it still be stuck?any ideas?
     
  14. Jan 15, 2022
    Allan

    Allan 74 Renegade

    Olympia
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  15. Jan 15, 2022
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
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    Mmm. Don't know. Linkage could be assembled wrong. Look at the TSM - there is a drawing of how the gears should be for each of the positions. Compare that to what you see from the bottom with the pan off. I don't see any other easy confirmation - maybe someone here will ahve a better suggestion.

    There is also a picture (8-17 in the '75 TSM) of the linkage.

    You can calculate the expected RPM at a given speed using one of many online calculators, like the Novak calculator https://www.novak-adapt.com/knowledge/gearing/ - this will be right, if you put the correct numbers in. You don't have your tachometer set to a 4 or 6 cylinder?
     
    Last edited: Jan 15, 2022
    Allan likes this.
  16. Jan 15, 2022
    jeep2003

    jeep2003 Well-Known Member

    Upstate NY
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    I look at it this way. The savings in insurance alone compared to a modern car is more than enough to make up for the price of gas. Without considering the cost of the vehicle and the parts prices. If you think a subaru baja is going to be cheaper to run think again.
     
  17. Jan 15, 2022
    Allan

    Allan 74 Renegade

    Olympia
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    Tach is set to 8cyl, So I’m not imagining this being to high RPMs for the speed, I can’t image want else it could be, new motor, linkage is great. I remember 3yrs ago before I rebuilt everything I took it in the freeway, wouldn’t even think of that now! Thanks for the ideas.
     
  18. Jan 15, 2022
    Jw60

    Jw60 Sitting up n buckled down. 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Sedalia MO.
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    New body mounts by chance? Any additional body lift?
     
  19. Jan 15, 2022
    Allan

    Allan 74 Renegade

    Olympia
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    No lift, all stock
     
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  20. Jan 15, 2022
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
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    What's your axle ratio and tire height? I would expect about 2500 RPM at 60. With the factory fan and exhaust, the engine is really winding it out at 4500.
     
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