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Old 07-25-2007, 06:43 PM   #1
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Two part question

number1: what is exactly the purpose of 4lo?

and two: what would cause me to not be able to go past 4h on the 4wheel shifter? i mean maybe im not trying hard enough but it seem like it wont budge.

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Old 07-25-2007, 07:08 PM   #2
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Quote:
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number1: what is exactly the purpose of 4lo?

and two: what would cause me to not be able to go past 4h on the 4wheel shifter? i mean maybe im not trying hard enough but it seem like it wont budge.
4L is for crawling speeds. On my new Jeep the manual says to shift from 4H to 4L at a speed under 5 MPH. Other vehicles I've owned, said you had to stop, switch to neutral and then shift into 4L. Check the manual for the specifics of your vehicle.

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Old 07-25-2007, 07:52 PM   #3
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Answer #1 - On every other 4x4 I have owned, putting into 4lo gives you a really low ratio, I assume it works the same on a jeep.

Answer #2 - do you have a body lift? A t-case lowering? Any of these things could be probelmatic, or busted linkage.
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Old 07-25-2007, 08:08 PM   #4
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4lo allows more control over the trail as lower speeds, it allows the jeep to craw over things: figure out your crawl ratio multi t-case range (2.72 for most yj tj etc) x 1st gear x axle ratio.
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Old 07-25-2007, 08:40 PM   #5
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Basically, it gives you the engine HP and Torque of 3500 rpms that you usually get at say 20 mph, at 7 mph. The reason is pretty obvious. You are gaining a LOT of HP and Torque at slower speeds. This means you can climb up/down/over obstacles with more power, at a slower, more controlled speed.

It also allows for more power, much more quickly. This is more for pickups etc. but you get the idea. Basically you would use it that way, if you need to have a LOT of power very fast, such as when moving a very large heavy trailer around the farm, or yanking out a tree stump etc. if you don't have room to run.

The only "downfall" with 4low, is the opposite of what it is doing. You loose wheel speed. There are certain kinds of mud, along with slippery hill climbs, when wheel speed is much more important than having all your torque quickly. Running your tires at 7mph with full torque will get ya stuck much faster than running your tires at 55mph with full torque when in some suction mud
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Old 07-25-2007, 09:09 PM   #6
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if you dont have a BL, and no T gase lowring kit, then you must either be doing something wrong or being too "shy", at around 3-4 mph, put it in neutral, then pull the tcase into neutral and continue through neutral to 4lo, it may take a few tries, but with a good hard tug it should go in, dont be worried about hurting the gears or breaking the handle, tug it nice and hard and evenly past neutral and into 4low and it should go, if not, let the clutch in and then try it again b/c the gears may be lining up exactly wrong if you get what i mean
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Old 07-25-2007, 09:26 PM   #7
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4L is also great when creeping along really narrow winding ATV trails. Sounds like you might just need a linkage adjustment. 5 minute job for someone that knows what they are doing. Mine did the same thing after a rebuild.
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Old 07-25-2007, 09:37 PM   #8
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i wish some of you guys lived around here ): <tear>
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Old 07-25-2007, 11:01 PM   #9
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how exactly should i go about trying to cahnge it?

meaning like the jeep on, in gear, off and out of gear. that type of thing.

thanks guys.
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Old 07-25-2007, 11:17 PM   #10
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oh yeah and once you get it in remember you will have to back up like 20 ft for it to disengage!
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Old 07-25-2007, 11:31 PM   #11
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but what about my previous post?
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Old 07-25-2007, 11:48 PM   #12
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I put mine in neutral and then rip the lever, sometimes you have to "rock" it and let it move a little bit, this way like debruins said all the gears have to mesh up right, and sometimes just a little movement causes this to happen. I come to a complete stop b4 doing anything, but I think some ppl. let it keep rolling.
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Old 07-26-2007, 09:44 AM   #13
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Quote:
Originally Posted by George T. View Post
how exactly should i go about trying to cahnge it?

meaning like the jeep on, in gear, off and out of gear. that type of thing.

thanks guys.
You might want to try this question again, what are you trying to "change"

When going from 4hi through neutral to 4lo you have to move the stick sideways, it's not a strait throw.
I wouldn't recommend trying to shift into 4 lo while moving, I don't know about other YJ's but mine gets all kinda pissed off when I try it while moving.
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Old 07-26-2007, 01:08 PM   #14
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the jeep can be running but it should be in neutral

i think that answers you question
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Old 07-26-2007, 03:08 PM   #15
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thanks guys
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Old 07-26-2007, 06:00 PM   #16
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Having 4L is what made a completely stock 95 Rio Grande make it through Carnage Canyon. Only "damage" I have is some scraps on the nerf bars. Not to mention having great spotters...

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