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proper use of 4Lo

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Old 08-30-2010, 05:39 PM   #1
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proper use of 4Lo

I'm a little confused on the proper use of 4Lo on trails. There seems to be a lot of contradictions on when to use it instead of 4Hi.

I know you are supposed to use it for hill climbing and other situations requiring high torque/slow speed. What are the other situations?

Also, on slippery rocks and logs, wouldn't having high torque be detrimental since you are more likely slip?

Should you ever use 4Lo in sand, snow, and mud?

Any help would be appreciated. I just want to learn.
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Old 08-30-2010, 05:45 PM   #2
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4lo is used where ever your going very slow (rocks/hills/etc) so you don't destroy your torque converter and the rest of the trans. I have used mine over logs, only two wheels hit it at one time so the front slipped but the back pushed me over.
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Old 08-30-2010, 05:48 PM   #3
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Quote:
Originally Posted by MontanaTaco View Post
4lo is used where ever your going very slow (rocks/hills/etc) so you don't destroy your torque converter and the rest of the trans. I have used mine over logs, only two wheels hit it at one time so the front slipped but the back pushed me over.
x2 with 3.73 its torque converter that takes a beating. 4L most of the time unless its quick ride through.
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Old 08-30-2010, 05:51 PM   #4
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I'm no expert, nor did I stay a holliday inn last night. Some situations such as low traction on snowy,wet or loose gravel roads can still be driven at higher speeds but traction benefits from 4 wheel drive over two wheel drive.

Some situations require maximum traction and this is usually best at lower speeds. traveling over rocky, loose and unstable ground using four low and at times you might need to use the aid of your rear locker or A-TRAC, wich both only work in 4 lo (on your 09 OR)
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Old 08-30-2010, 06:02 PM   #5
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Wouldn't high torque make it easy to slip on low traction situations though? I understand the low speed part, but when do you need high torque other than for climbing/pulling?
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Old 08-30-2010, 06:06 PM   #6
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I wouldn't say high torque, I would say gearing. slow speed and I mean crawling to avoid breaking traction.
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Old 08-30-2010, 06:12 PM   #7
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Quote:
Originally Posted by senna View Post

Some situations require maximum traction and this is usually best at lower speeds. traveling over rocky, loose and unstable ground using four low and at times you might need to use the aid of your rear locker or A-TRAC, wich both only work in 4 lo (on your 09 OR)
Is that the same for 1st gens? Cause I can never tell a difference when i turn it on. Do i need to change the fluid or anything?
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Old 08-30-2010, 06:23 PM   #8
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Go down a hill in 4hi in low gear... Then try 4lo in low gear down the same hill. You'll notice the difference!
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Old 08-30-2010, 06:24 PM   #9
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Quote:
Originally Posted by NAYo2002 View Post
Wouldn't high torque make it easy to slip on low traction situations though? I understand the low speed part, but when do you need high torque other than for climbing/pulling?
You always need high toque but can not afford it, due to truck making 2 MPG
4L gives you better control of wheels. Even big jumps on the gas pedal translates to a small changes on the wheels. So you will have your traction longer. Also you want your drive train to keep steady pace.
4Hi is good on flat road maybe iced, little snowed. As long as there is hard surface underneath 4Hi is ok Now if you end up in snow blizzard with 4 feet drifts you may start considering 4L.
4L is more for offroad terrain with uneven non-hard surface.
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Old 08-30-2010, 06:26 PM   #10
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So 4Lo is primarily used as a speed control? Should you ever use 4Lo in sand and mud since you are more likely to spin the wheel with high torque?
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Old 08-30-2010, 06:29 PM   #11
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Quote:
Originally Posted by BlueT View Post
You always need high toque but can not afford it, due to truck making 2 MPG
4L gives you better control of wheels. Even big jumps on the gas pedal translates to a small changes on the wheels. So you will have your traction longer. Also you want your drive train to keep steady pace.
4Hi is good on flat road maybe iced, little snowed. As long as there is hard surface underneath 4Hi is ok Now if you end up in snow blizzard with 4 feet drifts you may start considering 4L.
4L is more for offroad terrain with uneven non-hard surface.
But not on dry roads.
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Old 08-30-2010, 06:43 PM   #12
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Quote:
Originally Posted by brettb View Post
Is that the same for 1st gens? Cause I can never tell a difference when i turn it on. Do i need to change the fluid or anything?
We are talking about the locker correct?

So I don't think fluid will effect the locker operation like it would a true limited slip. You should change your fluid at least at factory recommended intervals.

Does your lite on the dash come on and stay steady? no blinking.

If the light is steady it is probably working. If you are ever in a situation where one rear wheel is off the ground and the locker is not engaged the you are stuck, if the locker is engaged then you keep on rolling. same goes for mud or what ever, just more obvious when one wheel is off the ground.
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Old 08-30-2010, 06:50 PM   #13
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Quote:
Originally Posted by S.B. View Post
But not on dry roads.
Correct no 4wd on hard dry pavement.

Quote:
Originally Posted by NAYo2002 View Post
So 4Lo is primarily used as a speed control? Should you ever use 4Lo in sand and mud since you are more likely to spin the wheel with high torque?
It depends on conditions.
No point for 4low if you going over hard packed sand or 1 inch of mud. But lets say you are on the beach with super soft sand and 20 miles trip, 4L will save tranny for you. Same thing in deep snow on country road. plus with 4l if you hit bump it is less likely for you to bump the gas pedal.
There is no clear guideline for it, its all about experience
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Old 08-30-2010, 07:46 PM   #14
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Quote:
Originally Posted by BlueT View Post
No point for 4low if you going over hard packed sand or 1 inch of mud. But lets say you are on the beach with super soft sand and 20 miles trip, 4L will save tranny for you. Same thing in deep snow on country road. plus with 4l if you hit bump it is less likely for you to bump the gas pedal.
There is no clear guideline for it, its all about experience
Wouldn't you want to keep it in 4Hi for super soft sand though? I thought you want to float in the sand and keep momentum. Wouldn't 4Lo just dig you down deeper?
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Old 08-30-2010, 07:51 PM   #15
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What I have learned from owning both a manual and automatic 4wd vehicle is that manual trucks should be in low most of the time. Why? Well because starting in deep sand in high will cause a smokey clutch. The only time I used 4wd high in my manual Ranger was for mud and snow. Wheel speed is important in those situations. Automatic 4wd vehicles can do more in 4wd high but then you can boil the tranny fluid if you aren't careful. If it requires quite a bit of throttle to get going then I move to low.
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Old 08-30-2010, 08:06 PM   #16
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4 Low is usually not bennificial in sand... as the high torque will spin the tires and just dig you in... deflate the tires and use 4 High in sand, in most circumstances.

When crossing through mud, if deep, then I want the increased torque and use L4.

Otherwise, the only situations for Low Range is getting out of a stuck (with A-TRAC on) or climbing and descending steep grades at a crawl rate. Anytime your speed is under 20 mph for long periods of time, it is kinder on your vdhicle to just use low range and calmly idle through.
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Old 08-30-2010, 08:06 PM   #17
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4-LO.....3 mph!!!!!
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Old 08-30-2010, 08:12 PM   #18
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i always wheel in lo unless it's just a trail or something light
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Old 08-30-2010, 08:25 PM   #19
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Quote:
Originally Posted by NAYo2002 View Post
Wouldn't you want to keep it in 4Hi for super soft sand though? I thought you want to float in the sand and keep momentum. Wouldn't 4Lo just dig you down deeper?
Floating has nothing to do with Torque unless you really have lead foot.
Did you ever rode mountain bike on soft sand? What did you use. high gear or low gear ?
Digging into the sand does not change because you have more torque. it depends on how many wheel rotations happened. Its just with 4L your torque converter will have easier time rotating wheels. People had been told the idea that high gear is better but that was in time when cars had 100 HP and no low end torque. Its 245 HP engine with torque converter that will deliver power if you mash the brakes. So if your floor mat gets stuck this thing is going to spin all 4 wheels regardless if you are in 4hi or 4 L
Just with 4 HI you going have less time to react.


Quote:
Originally Posted by whippersnapper02 View Post
What I have learned from owning both a manual and automatic 4wd vehicle is that manual trucks should be in low most of the time. Why? Well because starting in deep sand in high will cause a smokey clutch. The only time I used 4wd high in my manual Ranger was for mud and snow. Wheel speed is important in those situations. Automatic 4wd vehicles can do more in 4wd high but then you can boil the tranny fluid if you aren't careful. If it requires quite a bit of throttle to get going then I move to low.
x2
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Old 08-31-2010, 05:59 AM   #20
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Quote:
Originally Posted by BlueT View Post
Floating has nothing to do with Torque unless you really have lead foot.
Did you ever rode mountain bike on soft sand? What did you use. high gear or low gear ?
Digging into the sand does not change because you have more torque. it depends on how many wheel rotations happened. Its just with 4L your torque converter will have easier time rotating wheels. People had been told the idea that high gear is better but that was in time when cars had 100 HP and no low end torque. Its 245 HP engine with torque converter that will deliver power if you mash the brakes. So if your floor mat gets stuck this thing is going to spin all 4 wheels regardless if you are in 4hi or 4 L
Just with 4 HI you going have less time to react.
Just to clarify, you are saying I should use it in 4Lo in sand and mud but give very little throtle to ensure wheel spin does not occur?
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