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Old 07-24-2010, 01:00 PM   #1
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Proper uses of 2H, 4H, and 4L.

Hi all just found a very good article on the proper uses of 4WD for Jeeps. The author has a 2004 TJ but the info here should be read by all especially those new to Jeeps. The article was to long to post on the forums but it can be read here at Jeep.US41.org/4WD Take a moment to read over this if you have any question about operating your Jeep in 4WD. Hopefully this will help alot of Jeepers.

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Old 07-24-2010, 01:20 PM   #2
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ESP123, thanx, thats a great general article and "MOSTLY" applies to the JK jeep, but

If you have an AUTO JK and you're not already modified for off-road EXTREME uses only--you should always --

Use 4LO for sand/rough terrain hills and deep snow (2'+++)

The larger the tires, the more NEED for 4lo-

Back to your favorite channel

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Old 07-24-2010, 01:25 PM   #3
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Pretty good article, I enjoyed it. I have used low-range every time I have been off road so far because I like the low gear ratio. I have a manual trans and it's easier to creep along in second or third gear without having to do a lot of clutching. If I had an auto I'd use high range more often.
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Old 07-25-2010, 07:36 AM   #4
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I use 4hi most of the time. lots of mud here in Ohio, so momentum and a little speed are our best allies. 4lo is great for going up and down hills, and the few rocks we have.
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Old 07-25-2010, 11:54 AM   #5
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You have 4-wheel drive, use it. Why do some people tear up roads and trails spinning their tires in two wheel drive
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Old 09-17-2010, 09:52 PM   #6
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What planet is that guy from? "different gears ratio in front than in rear - 3.73 in rear, 3.74 in front" - what a crock of bull! "driving on dry pavement will melt the transfer case" May not be the best idea, but come on, really?
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Old 09-17-2010, 10:22 PM   #7
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I've seen this one... The guy says right off the bat that he's new to 4WD, and if you take that into account, it's pretty well written and a good starting point for someone who's just figuring it out. I disagree with a lot of it, but I also disagree with Jimbo even while I tell everyone that they should listen to him...

4WD is a tool you use to drive, sort of like a welder is a tool you use to make metal stuff... I used my cheapo little wire feed welder to cut some steel wire this afternoon... is that wrong? yes... that's wrong, but I was welding a wire frame, and welding the excess wire off the ends was faster and easier than using bolt cutters, so wrong and yet perfectly sensible and reasonable. The point is that how you use your 4WD "tools" is going to be specific to you, and "what everyone else does" might not be the best fit for you.
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Old 09-17-2010, 10:31 PM   #8
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Heh Heh, well if you have a JKU with an Auto, I'm sorry you dissagree with me

If you don't have a JKU with/auto--you don't have any idea of what I'm talking about !!

Well, do you have a JKU with auto-or no ???

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Old 09-17-2010, 10:59 PM   #9
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Yes I do and it wasn't meant to be confrontational... the point I was trying to make is that you and I have very different views on using 4WD, and that neither viewpoint is "right" or "wrong", but that most folks would do a lot better doing it your way than they would mine.
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Old 09-18-2010, 01:57 AM   #10
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As long as your going in pretty much a straight line 4wd is fine on pavement. Just make sure to put it 2wd before a turn. If you haven't been off road in awhile it's good to put it in 4wd to throw some oil around in the diff to keep things well lubed. About a mile a month all it needs. That was even in a owners manual for a 4X4 I owned some years past, although it escapes me at the moment which one. But I'm sure no one here goes more than a month without getting off road. Right?
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Old 09-18-2010, 09:02 AM   #11
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Yea, most of us have different reasons/views on the use of 4wd--depends on Needs/occupation/military/SAR/pleasure/and Climate of residence/EXPERIENCE !!

Good morning ael !

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Originally Posted by aelwero View Post
Yes I do and it wasn't meant to be confrontational... the point I was trying to make is that you and I have very different views on using 4WD, and that neither viewpoint is "right" or "wrong", but that most folks would do a lot better doing it your way than they would mine.
I know you were just offering your opinion and I do respect that, my comments about the major use of 4lo, are only based on the overheating tendencies of the JK 42RLE auto, although mine is cured of that, but my 4hi/4lo habits are still with me

As I said in another post--My JKU is a hobby, a 4WD hobby, not a DD and wear/tear are inconsequencial, so as soon as I get to dirt--4HI, that warms up the t-case insides/oil/gears and makes a NEEDED shift into 4lo, that much easier and swifter (easy on the dreaded bushing)!!

Have a great day !!

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Old 09-27-2010, 09:42 PM   #12
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bump for others
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Old 09-27-2010, 09:57 PM   #13
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I'm always in 4lo but the only places I go involve some short but very steep inclines declines and sharp turns, of course I do drive a manual.. And I'd love to see someone try to tackle these hills without stalling lol
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Old 09-27-2010, 09:59 PM   #14
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As long as your going in pretty much a straight line 4wd is fine on pavement. Just make sure to put it 2wd before a turn. If you haven't been off road in awhile it's good to put it in 4wd to throw some oil around in the diff to keep things well lubed. About a mile a month all it needs. That was even in a owners manual for a 4X4 I owned some years past, although it escapes me at the moment which one. But I'm sure no one here goes more than a month without getting off road. Right?

That is completely and utterly false. You do not need to put it in 4WD to "throw some oil around in the diff to keep things well lubed." Your differential gears are covered oil constantly and has nothing to do with 4WD. The only thing you'd be doing is making sure your transfer case linkage is free and moving properly.
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Old 09-27-2010, 10:11 PM   #15
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I'm always in 4lo but the only places I go involve some short but very steep inclines declines and sharp turns, of course I do drive a manual.. And I'd love to see someone try to tackle these hills without stalling lol
That is in 4hi... Haha
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Old 09-27-2010, 10:14 PM   #16
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I think theres been 3 other thread and it was concluded that you must at all times use your front locker on the snow, 4lo on highway when theres light rain, and dont forget to top off your blinker fluid .


yeah but dont do that
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Old 09-27-2010, 10:41 PM   #17
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Quote:
Originally Posted by lanse42 View Post
As long as your going in pretty much a straight line 4wd is fine on pavement. Just make sure to put it 2wd before a turn. If you haven't been off road in awhile it's good to put it in 4wd to throw some oil around in the diff to keep things well lubed. About a mile a month all it needs. That was even in a owners manual for a 4X4 I owned some years past, although it escapes me at the moment which one. But I'm sure no one here goes more than a month without getting off road. Right?
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That is completely and utterly false. You do not need to put it in 4WD to "throw some oil around in the diff to keep things well lubed." Your differential gears are covered oil constantly and has nothing to do with 4WD. The only thing you'd be doing is making sure your transfer case linkage is free and moving properly.
Exactly what daggo said... there is a phrase that I've heard with 4wd vehicles and that is, "Use it or lose it."

The reason behind that phrase is if you rarely ever put your vehicle in 4wd, your linkage eventually begins to rust up and stick and then you either can't get it to pop into/out of 4wd or you snap something in the linkage trying.

There's probably a few other things it lubricates/frees up...but nothing I can think of that would cause your 4wd not to work anymore.
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Old 09-27-2010, 11:08 PM   #18
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No manual can tell you the proper use. Like anything, experience, experiment, and experience....
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Old 09-28-2010, 01:22 AM   #19
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Originally Posted by s3nt3nc3d

Exactly what daggo said... there is a phrase that I've heard with 4wd vehicles and that is, "Use it or lose it."

The reason behind that phrase is if you rarely ever put your vehicle in 4wd, your linkage eventually begins to rust up and stick and then you either can't get it to pop into/out of 4wd or you snap something in the linkage trying.

There's probably a few other things it lubricates/frees up...but nothing I can think of that would cause your 4wd not to work anymore.
I really can't disagree with either one of you. I don't think it hurts anything not to use 4wd for an extended period but at some point the use it or loose it does apply. However, the differential is not full of oil. The fill bolt is only about half way up the case and that is how much oil is in it. Nothing above the fill bolt is lubricated until the differential gears see movement. That said I've pulled out gears that haven't turned in 40 years and they've looked pretty good still.
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Old 09-28-2010, 06:06 AM   #20
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I really can't disagree with either one of you. I don't think it hurts anything not to use 4wd for an extended period but at some point the use it or loose it does apply. However, the differential is not full of oil. The fill bolt is only about half way up the case and that is how much oil is in it. Nothing above the fill bolt is lubricated until the differential gears see movement. That said I've pulled out gears that haven't turned in 40 years and they've looked pretty good still.
I was exaggerating for effect. Yes the bottom half is in oil, but that's the half that's meshing. As they turn they slop it upward toward the rest.
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Old 09-28-2010, 06:19 AM   #21
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I really can't disagree with either one of you. I don't think it hurts anything not to use 4wd for an extended period but at some point the use it or loose it does apply. However, the differential is not full of oil. The fill bolt is only about half way up the case and that is how much oil is in it. Nothing above the fill bolt is lubricated until the differential gears see movement. That said I've pulled out gears that haven't turned in 40 years and they've looked pretty good still.
You do realize that the diff gears get lubed without being in 4wd. Your front diff is spinning and moving even in 2wd, causing the oil to lube the gears as you drive, since the front DS is spinning as well. The only way it would not be, is if you have manual hubs.

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Old 09-28-2010, 06:48 AM   #22
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You do realize that the diff gears get lubed without being in 4wd. Your front diff is spinning and moving even in 2wd, causing the oil to lube the gears as you drive, since the front DS is spinning as well. The only way it would not be, is if you have manual hubs.

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Old 09-28-2010, 06:49 AM   #23
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You mean the 710 cap? You should check out this place: http://kalecoauto.com/index.php?main...7c8c0b2p82nnc6

They've just come out with a new engine oil bypass kit.

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