Anyone run tractor tires on their KJ?

Discussion in 'Tires / Wheels' started by CrazyDrei, Jan 3, 2021.

  1. CrazyDrei

    CrazyDrei Space Monkey

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    So Santa dropped off a set of tractor tires that I plan on mounting on my Liberty pickup truck.

    Has anyone actually run tractor tires on their Liberty?
    What size did you go with?
    How did they drive?

    [​IMG]

    Got me some Titan High Traction Lug tires which I'll be mounting next week.

    Everyday I walk past them I wonder what I really got myself into this time.
     
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  2. lfhoward

    lfhoward Full Access Member

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    Can’t say that I have! :D

    Will those things even work on pavement? Handling would be dicey! :eek: Of course if you’re building an off road only rig, they could be pretty unstoppable. :cool: Where do you see yourself going with these?
     
  3. CrazyDrei

    CrazyDrei Space Monkey

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    Yes these tires can not go over 20mph, and will not see pavement. My Liberty is more of a yard truck/side by side UTV than a SUV and will spend the rest of it's life hauling stuff in my yard and maybe get out on an ATV trail here or there.

    I have a lot of mud and snow in my yard and tired of the Liberty getting stuck just about every time I get out on the current tires it has. This might be a slight overkill but if it will keep me from getting stuck it will be worth it.
     
  4. sota

    sota Full Access Member

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    you're a crazy man, but i'm intrigued enough to want to see where this is going.
     
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  5. tommudd

    tommudd Moderator Staff Member Moderator

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    Have seen a few KJs on facebook that did for a short time
    I ran 30 inch tall ones on my 68 Bronco back in the late 70s
    Had a set of pull type 3 bottom plows that I used to plow the corn field with
    6 cylinder, 3 on the tree, 4.10 gears, in low range I could start it out and get out walk around as it went out through the field
    better than sitting on a tractor with no radio etc LOL
     
  6. CrazyDrei

    CrazyDrei Space Monkey

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    Interesting, I have not been able to find anything about AG tires on a KJ.

    Do you know why they were run for a short time? I can speculate the strain on drive train and excessive wight of the tires or possibly the impossibly harsh 5mph ride on anything harder than knee deep mud?

    I am a little nervous about my new 33" tractor tires for the KJ with nothing more than a 2" eBay level. This one might take some creativity to fit.
     
  7. tommudd

    tommudd Moderator Staff Member Moderator

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    Couple of the people were running skid steer tires, so yes heavy tires to begin with and lots wider than most so lots of rubbing when trying to turn
    One ran a couple of runs and tore out his front diff so of course then he Hated Jeeps due to them being built so bad ;)
    And yes harsh ride is what I remember when I ran them, but I was young and foolish ( 20-22 years old ) and it looked cool plus the old Bronco would just dig in and go anywhere
    Never ran it anywhere but on the farm with them on
    Had 12-15s for street use , yes was before radial tires etc

    Good luck with, spacer lift and 33s
     
  8. CrazyDrei

    CrazyDrei Space Monkey

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    Haha, tearing out a front diff due to poor life choices is no reason to hate jeeps.

    Good to hear that they dig in a go anywhere, thats exactly what I need in my yard. Don't care too much for suspension articulation or clearance unless I get anther 22" snow storm, just need to not spin tires in loam or mud.

    My KJ will never see pavement or get out of 4x4 low, lots of yard/farm use and maybe an ATV trail or two if I am brave enough.

    Getting one tire mounted and mocked up this week, lift this weekend and hopefully all 4 on before February.
     
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  9. CrazyDrei

    CrazyDrei Space Monkey

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    [​IMG]

    So the tires are in, mounted and bolted onto the Liberty.

    Any thoughts on running different diameter tires front and back? Say 1/2" difference?
     
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  10. duderz7

    duderz7 Full Access Member

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    Horrible idea on a 4x4, but you don't strike me as a guy who shys away from horrible ideas. rubbing a bit while turning?
     
  11. Doing10to20

    Doing10to20 Full Access Member

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    Why is it horrible?
     
  12. duderz7

    duderz7 Full Access Member

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    A 4x4 is usually designed to have all 4 tires spinning at the same speed while in 4 wheel drive. If some of them are a different size you'll either have constant slippage or something broken.
     
  13. CrazyDrei

    CrazyDrei Space Monkey

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    duderz7,

    Yes you are absolutely correct, however if that was 100% true all of our 4x4s would be broken on the side of the road right now. I am willing to bet that at least one of anyone's tires is not "exactly" at the same pressure or wear as the others. This brings me to the next question, what is the acceptable tolerance for the difference?

    I am not looking for google 2/32s answer because it's pretty much meaningless. What percentage difference is acceptable before it causes serious damage.

    I have 1/2 to 3/4" difference between my front and rear 37" tires, ran the rig that way for 6 years and over 170k miles of everything from 75mph highway to 60mph 4x4 high desert washboard to 4x4 low crawling and have not had any issues with diffs, or transfer case.

    I also know for a fact that if you have 4.10 gears in the front and 3.73 gears in the rear, in 4x4 low you will snap the rear (faster spinning) axle within 20 feet. Been there done that, now I know.

    Lets get back to the Liberty. This is where I am right now:

    [​IMG]

    33.25" by 9.49" up front and
    33.7" by 9.7" in the rear

    As far as I know Liberty has open front, center and rear diffs so until I lock the rear the spider gears in the open diffs should have enough of a tolerance for a 1.4% circumference difference. This is no different than having front tire pressure 5psi lower than the rear.

    Is my practical experience and calculations missing something that internet experts know of?
     
  14. duderz7

    duderz7 Full Access Member

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    I see your points, but why try to do something you know is wrong just because you might get away with it. And I don't know about yours, but my transfer case does not have habe a diff. Meaning at least one front and one rear tire want to spin at the same speed always. Not trying to talk you out of it, you've already made up your mind. But you asked and I answered.
     
  15. CrazyDrei

    CrazyDrei Space Monkey

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    duderz7,

    I have NP231 so no open center diff. I am not familiar with the 231 yet but will once I rip it apart in the near future.

    I am more concerned about finding actual tolerances for the parts than hypothetical reasoning.

    Completely agree with your point "why try to do something you know is wrong just because you might get away with it." But how is it any different from actually getting away with doing something wrong and not knowing that you are doing it?
     
  16. CrazyDrei

    CrazyDrei Space Monkey

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    [​IMG]
     
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  17. Aceofspades

    Aceofspades Full Access Member

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    Wow. Impressive lol. Like if a geo tracker and Jeep liberty had a bastard child